Cannot get .NET Framework 3.5 sp1 x64 to install. MSI Errs out stating that MS .NET Framework 2.0a x64 is missing. This should be part of the .NET Framework 3.5 sp1 installation.

Visual Studio is not an update, but a MS suite that will update after install.
http://www.microsoft.com/visualstudio/eng/downloads#d-2010-express

Hello For .Net Framework 4.0 following are the pre requisite:-
System Requirements Supported Operating Systems:Windows 7;Windows Server 2003 Service Pack 2;Windows Server 2008;Windows Server 2008 R2;Windows Vista Service Pack 1;Windows XP Service Pack 3 Windows XP SP3 Windows Server 2003 SP2 Windows Vista SP1 or later Windows Server 2008 (not supported on Server Core Role) Windows 7 Windows Server 2008 R2 (not supported on Server Core Role)
Supported Architectures: x86 x64 ia64 (some features are not supported on ia64 for example, WPF)
Hardware Requirements: Recommended Minimum: Pentium 1 GHz or higher with 512 MB RAM or more Minimum disk space: x86 - 850 MB x64 - 2 GB
Prerequisites: Windows Installer 3.1 or later Internet Explorer 5.01 or later
If you fulfill above requirement then go to http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en
and click on download, you will found other instructions over there
Good Luck, do rate the solution if got help

Error 1603 is related to insufficient rights to install QB. Please follow these steps to resolve this issue. Assuming you have Win XP. 32 Bit OS.

1. Remove QB from Start>control panel>Add/remove programs. {IF YOU FIND ANY QB INSTALLED].
2. Rename all intuit folders to Intuit-old. You wil find these folders here:

• C:\Program Files\Intuit
• C:\Program Files\Common Files\Intuit
• C:\Documents and Settings\All Users\Application Data\Intuit
• C:\Documents and Settings\All Users\Application Data\Common Files\Intuit
  

3. Then install QB using QuickBooks.msi . You will find it inside QBooks folder in your QB disc. Right click on the DVD / CD drive and click Open/Explore. Then go to Qbooks folder, find Quickbooks.msi and then run it. Follow the wizard and then install it.

IF STILL ISSUE IS UNRESOLVED, THEN REMOVE AND INSTALL MICROSOFT .NET FRAMEWORK 2.0 SP2. To do it, please follow.

1. Download and install .NET removal tool from:
http://public.blu.livefilestore.com/y1pM-hUF1x_Oqpme4sYbkLY1eFfh7z7FTyANwGAK1PQgJMwhILtFzMj7WXQJtjfH39GalpsBeQRzeQHXRlbO9w1gA/dotnetfx_cleanup_tool.zip?download&psid=1
then save it and unzip it . Then run it. Select Allversions in the box where it will ask to remove .net framework from the computer.
2. Download .NET framework 2.0 SP1 and then install it . you can download it from:
http://www.microsoft.com/downloads/en/details.aspx?familyid=5b2c0358-915b-4eb5-9b1d-10e506da9d0f&displaylang=en
click on DOWNLOAD next to NetFx20SP2_x86.exe. download it and install it.
3. Restart your computer and then again install QB.


IF STILL YOU GET ANY ISSUE, REPLY WITH FOLL :
1. WINDOWS VERSION.
2. are you installing QB using a disc or downloading from the Internet?
3. Any Antivirus on the computer?

Not sure whether this is a Q.
To enable just in time (JIT) debugging, the config file for this application or machine (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled. For example: <configuration> <system.windows.forms jitDebugging="true" /> </configuration> When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the machine rather than being handled by this dialog.
In VS the way to enable/disable that is: 1-On the "TOOLS" menu, click Options. 2-In the Options dialog box, select the Debugging folder. 3-In the Debugging folder, select the Just-In-Time page. 4-In the Enable Just-In-Time debugging of these types of code box, select or clear the relevant program types: Managed, Native, or Script. To disable Just-In-Time debugging, once it has been enabled, you must be running with Administrator privileges. Enabling Just-In-Time debugging sets a registry key, and Administrator privileges are required to change that key. 5-Click OK.
It has to be done by the developer and its his responsible to guide the application error reporting to the system event handlers. If this is an issue which occurs in a certain app, have to check for the .net version (specially in vista). Many 1.0 and 1.1 based apps give the problem. To install dotnet fw 1.1 on Vista will give an error. Most of the time caused by DEP (Data Execution Prevention). But the thing is some software forces the installation of .net framework (older versions). How ever Vista is packed with .net 3.0 and 2.0. Even if you allowed to install will not be able to uninstall 2.0 (possible to remove 3.0 though).
How to solve the installation issue: This issue is resolved in Microsoft .NET Framework 1.1 SP1, however you will need to use the following procedure to install both the .NET Framework and the Service Pack at the same time: Download Microsoft .NET Framework 1.1 Redistributable Package and Microsoft .NET Framework 1.1 Service Pack 1 using links below: Dotnet Framework 1.1 Redest Dotnet Framework 1.1 SP1
Save both installations in the same directory Ensure that the Microsoft .NET Framework 1.1 Redistributable Package is named dotnetfx.exe. If not, change its name to dotnetfx.exe. Ensure that Microsoft .NET Framework 1.1 Service Pack 1 is named dotnetfxsp1.exe. If not, change its name to dotnetfxsp1.exe. Open command prompt as Administrator, and change to the directory where the two installations are saved. Run the following commands using the order shown below dotnetfx.exe /c:"msiexec.exe /a netfx.msi TARGETDIR=C:dotnet" dotnetfxsp1.exe /Xp:C:dotnet etfxsp.msp msiexec.exe /a c:dotnet etfx.msi /p c:dotnet etfxsp.msp Install both Microsoft .Net Framework 1.1 and Service Pack 1 by running C:dotnet etfx.msi
The systems must be backed up before trying this specially the system state. How ever the keys can be repaid in a damage This thread will also be helpful http://blogs.msdn.com/b/astebner/archive/2007/03/26/how-to-repair-the-net-framework-2-0-and-3-0-on-windows-vista.aspx...

No deed of various software. But you have to have .net framework 2sps and .net framework 3.
Download from here.

Its compatible with Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP

You need Windows Installer 3.1(v2)
or Windows Installer 4.5
Its good to have .NetFW 2.0 SP1
or
.NetFW 3.0 Recommended
Upgrade it to SP1

.NetFW 3.5
.NetFW 3.5 SP1
All of these are 32 bit packages and if you want any 64 bit package, go to Microsoft.
Other Requirements. - HW

Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentium processor or equivalent (Recommended)

RAM:96 MB (Minimum); 256 MB (Recommended)

Hard Disk: Up to 500 MB of available space may be required

CD or DVD Drive: Not required

Display: 800 x 600, 256 colors (Minimum); 1024 x 768 high color, 32-bit (Recommended)

Please be kind enough to rate this answer.
Enjoy.
Best of Luck
:)

Hi. The downloaded .msi package actually contains a couple of versions of .net (for different kind of processors). If you connect your PDA to your computer (Using ActiveSync for XP or Windows Mobile Device Center for Vista) and run that .msi package, it will automaticly detect your PDA's processor and installs the .net to your device. Hope this helps.

You need to uninstall and install the latest version of .net frame work

You can download it from www.microsoft.com/downloads

Windows Update error code "0x643" and Windows Installer error code "1603" are generic error codes. Typically, these error codes mean that the update was not installed. These errors codes are usually caused by a corruption in the .NET Framework installation or by an inconsistency on the MSI database state.


Method 1: Manually remove and reinstall .NET Framework loadTOCNode(2, 'resolution'); To manually remove and reinstall the .NET Framework, follow these steps:

1. Remove the .NET Framework.
   1. Click Start, and then click Control Panel.
   2. Double-click Add or Remove Programs.
   3. Note each version of the .NET Framework that is already installed on the computer. Then, uninstall all the versions of the .NET Framework.
   4. When you are prompted, restart the computer.
2. Use the Windows Installer CleanUp Utility to clean up the MSI database state for all the versions of the .NET Framework.
   1. Download the Windows Installer CleanUp Utility. The following file is available for download from the Microsoft Download Center:
      Download the Windows Installer CleanUp Utility package now. (http://download.microsoft.com/download/e/9/d/e9d80355-7ab4-45b8-80e8-983a48d5e1bd/msicuu2.exe)
      
      For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 119591 (http://support.microsoft.com/kb/119591/ ) How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
   2. Install the Windows Installer CleanUp Utility as an administrator or as a user account that is a member of the local Administrators group.
   3. Click Start, point to All Programs, and then click Windows Install Cleanup.
   4. In the Windows Installer CleanUp Utility, remove all Windows Installer applications for the .NET Framework.
3. Restart the computer.
4. Download and then reinstall all the versions of the .NET Framework that were previously installed on the computer.
   
   To download the .NET Framework 1.0, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?FamilyID=d7158dee-a83f-4e21-b05a-009d06457787&amp;DisplayLang=en (http://www.microsoft.com/downloads/details.aspx?FamilyID=d7158dee-a83f-4e21-b05a-009d06457787&DisplayLang=en) To download the .NET Framework 1.0 Service Pack 3, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=6978D761-4A92-4106-A9BC-83E78D4ABC5B&amp;displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=6978D761-4A92-4106-A9BC-83E78D4ABC5B&amp;displaylang=en) To download the .NET Framework 1.1, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=262D25E3-F589-4842-8157-034D1E7CF3A3&amp;displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=262D25E3-F589-4842-8157-034D1E7CF3A3&amp;displaylang=en) To download the .NET Framework 1.1 Service Pack 1, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=A8F5654F-088E-40B2-BBDB-A83353618B38&amp;displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=A8F5654F-088E-40B2-BBDB-A83353618B38&amp;displaylang=en) To download the .NET Framework 2.0, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&amp;DisplayLang=en (http://www.microsoft.com/downloads/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&amp;DisplayLang=en) To download the .NET Framework 2.0 Service Pack 1, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=79BC3B77-E02C-4AD3-AACF-A7633F706BA5&displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=79BC3B77-E02C-4AD3-AACF-A7633F706BA5&displaylang=en) To download the .NET Framework 3.0, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en) To download the .NET Framework 3.0 Service Pack 1, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=EC2CA85D-B255-4425-9E65-1E88A0BDB72A&displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=EC2CA85D-B255-4425-9E65-1E88A0BDB72A&displaylang=en) To download the .NET Framework 3.5, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=333325FD-AE52-4E35-B531-508D977D32A6&displaylang=en (http://www.microsoft.com/downloads/details.aspx?familyid=333325FD-AE52-4E35-B531-508D977D32A6&displaylang=en)
5. When you are prompted, restart the computer.

Note When you have reinstalled all the versions of the .NET Framework, you can use Windows Update to check for updates to the .NET Framework.

try to complete uninstall .net framework and install it again or get the latest copy of .net framework to install 3.5 latest version already available for download