I deleted apple ,quicktime ,apple mobile device support,apple software updater,bonjour,apple software updater then went into system32 and deleted quicktime and quicktimevr as was instructed on the apple help site to get itunes completly removed then reinstalled itunes and quicktime and now i can`tget itunes to download onto my computer but i can open quicktime,on the desktop it says cannot download file unexpected error occured- 50

According to Apple Use the Control Panel to uninstall iTunes in the following order and restart your computer :
iTunes,Apple Software Update,Apple Mobile Device Support,Bonjour,
Apple Application Support.
if your have faced any issue then follow https://discussions.apple.com/message/21392445 and
Apple and Mac Technical Support for more help.

Uninstall Apple Application Support, Apple Mobile Device Support, Apple Software Update, Bonjour, iTunes, and Quicktime. Basically any Apple software.
Download and re-install itunes, it will install all of the above.
Open iTunes. It now runs correctly.
I was having the same problem until I did this, and it fixed the problem right away.
Sit back and enjoy music.

QUICKTIME Player software from Apple is required

1.- Download Apple Quicktime for free
http://www.apple.com/quicktime/?CID=exit&idhbx=applequicktime

2.- play a music file in Quicktime
3.- Close Quicktime
4.- Restar the Pc
5.- Install Kodak easy share software

if it was useful
placa arte points and comments

uninstall itunes and the other components such as quicktime, apple mobile device support, apple application support,apple software update and bonjour.

• go to your control panel and add or remove programs(win vista or 7) or programs and features(win XP)

• remove the stated programs from above, restart your computer

• visit apple.com/itunes and download iTunes and install.

• plug your iPhone in and then it will load the driver for it and then be recognized again by your itunes and computer

try to uninstall all apple software from your computer

e.g. iTunes, Quicktime, bonjour etc.
delete temp files
click start > run > cmd > type "%temp%" without the double quotes
then select all files then delete all of them

restart the computer

try to download and install Itunes
if still doesnt work

download CCleaner to remove all traces of apple/itunes from your computer then restart and reinstall after restart.

hope this help

Learn how to completely uninstall iTunes, QuickTime, and other essential software components from your Windows XP PC.
How ToFor Windows Vista or Windows 7, see this article.
Expand All Sections | Collapse All Sections
In some rare instances, it may be necessary to remove all traces of iTunes, QuickTime, and related software components from your computer before reinstalling iTunes.
Use the Control Panel to uninstall iTunes and related software components in the following order:

1. iTunes
2. QuickTime
3. Apple Software Update
4. Apple Mobile Device Support
5. Bonjour
6. Apple Application Support (iTunes 9 or later)

Important: You may see various alert messages if you uninstall these applications in a different order or only uninstall certain components.
For detailed steps on removing and reinstalling iTunes and related components on Windows XP, refer to the following steps:
Removing iTunes Note: iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes.

1. Quit iTunes.
2. From the Start menu, choose Control Panel.
3. In Control Panel, open Add or Remove Programs.
4. Select iTunes from the list of currently installed programs, then click Remove.
5. When asked if you would like to remove iTunes, select Yes.
6. After the uninstallation is complete, do not restart your computer if you are prompted to.
7. If other program entries were listed for iTunes in Add or Remove Programs, remove those as well.
8. In Add or Remove Programs, remove any iPod Updater applications that are listed in the same fashion as iTunes was removed.

Removing QuickTime

1. Quit QuickTime Player.
2. From the Start menu, choose Control Panel.
3. In Control Panel, open Add or Remove Programs.
4. Select QuickTime from the list of currently installed programs, then click Uninstall.
5. When asked if you would like to remove QuickTime, click Yes.
6. After the uninstallation is complete, do not restart your computer if you are prompted to.
7. If other program entries were listed for QuickTime in Add or Remove Programs, remove those as well.

Removing Apple Software Update

1. Quit Apple Software Update.
2. From the Start menu, choose Control Panel.
3. In Control Panel, open Add or Remove Programs.
4. Select Apple Software Update from the list of currently installed programs, then click Uninstall.
5. When asked if you would like to remove Apple Software Update, click Yes.
6. After the uninstallation is complete, do not restart your computer if you are prompted to.
7. If other program entries were listed for Apple Software Update in Add or Remove Programs, remove those as well.

Removing Apple Mobile Device Support

1. From the Start menu, choose Control Panel.
2. In Control Panel, open Add or Remove Programs.
3. Select Apple Mobile Device Support from the list of currently installed programs, then click Uninstall.
4. When asked if you would like to remove Apple Mobile Device Support, click Yes.
5. After the uninstallation is complete, do not restart your computer if you are prompted to.

Notes: Do not manually delete the Mobile Device Support folder located at C:Program FilesCommon FilesApple. Use Add or Remove Programs as described in the steps above.
Removing Bonjour

1. From the Start menu, choose Control Panel.
2. In Control Panel click "Add or Remove Programs."
3. Select Bonjour from the list of currently installed programs then click Uninstall.
4. When asked if you would like to remove Bonjour click Yes.
5. After the uninstallation is complete do not restart your computer if you are prompted to.

Removing Apple Application Support (iTunes 9 or later)

1. From the Start menu, choose Control Panel.
2. In Control Panel, open Add or Remove Programs.
3. Select Apple Application Support from the list of currently installed programs, then click Uninstall.
4. When asked if you would like to remove Apple Application Support, click Yes.
5. After the uninstallation is complete, do not restart your computer if you are prompted to.

Verify iTunes and related components are completely uninstalled

1. Restart your computer.
2. After the computer restarts, open Local Disk (C:) located in Computer or whichever hard disk your programs are installed on.
3. Open the Program Files folder.
4. Right-click the iTunes folder, choose Delete, and choose Yes when asked to confirm the deletion. Note: This folder may have already been deleted if iTunes was successfully removed.
5. Right-click the iPod folder, choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
6. Right-click the QuickTime folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
7. Right-click the Bonjour folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
8. Open the Common Files folder.
9. Right-click the Apple folder (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
10. Open Local Disk (C:) located in Computer or whichever hard disk your operating system is installed on.
11. Open the Windows folder.
12. Open the System32 folder.
13. Right-click the QuickTime file (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
14. Right-click the QuickTimeVR file (if it exists), choose Delete, and choose Yes when asked to confirm the deletion. Click Continue if Windows needs confirmation or permission to continue.
15. Right-click the Recycle Bin and choose Empty Recycle Bin

Reinstalling iTunes and related components After verifying that iTunes is completely uninstalled, you should download and install the latest version of iTunes.
Additional Information iPodService.exe Alert Follow these steps if the message, "Cannot delete iPodService.exe: It is being used by another person or program" appears when you try to delete the iPod folder.

1. Make sure that iTunes and the iPod Updater utility are not open.
2. Press and hold Control-Alt-Delete. Select Start Task Manager.
3. Click the Processes tab.
4. Locate "iPodService.exe" in the list.
5. Click "iPodService.exe" and choose End Process.
6. Quit the Task Manager.

You can download the Windows Installer Cleanup Utility from Microsoft, which will clean up any leftover installer files that may be causing issues with your current installation. To do this:

http://support.microsoft.com/default.aspx?scid=kb;en-us;290301

Click the "Download the Windows Installer Cleanup Utility package now" link

-Choose Start > All Programs and then click Windows Install Cleanup; the Windows Installer Clean Up Utility window appears, listing software that is currently installed on your computer.

-Select iTunes from the list and click Remove.
-Click OK in the confirmation dialog that appears.
- if it prompts to restart - choose restart later

-Repeat this step for removing these progrmas as well in order

QuickTime
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)

-Click OK in the confirmation dialog that appears.

Click Exit.
Restart the computer.

download itunes again

http://www.apple.com/itunes/download/

you sure your problem is the 'download' part?? or is it the installation part??

if it's the download part I would suggest for you to attempt to download the installation file in another computer, put it on the thumb drive and bring it over to the laptop where you want to install the itunes.

if you have problems installing itunes you probably may want to uninstall
the following programs and in the following order

1. iTunes
2. QuickTime
3. Apple Software Update
4. Apple Mobile Device Support
5. Bonjour
6. Apple Application Support (iTunes 9 or later)

if you can't uninstall them with 'add and remove programs', I would suggest to use this windows uninstaller and clean up utility

only once you have uninstalled all the programs above, run the itunes installer and all the programs updated will be installed one at a time.

hope this helps

Here's some info that may help - picked up from other boards where similar problems reported.
First check to see if Quicktime works normally, iTunes will not work without it.
If Quicktime is OK, then use these troubleshooting articles: XP version http://support.apple.com/kb/TS1421 Vista version http://support.apple.com/kb/TS1717
Have you installed any of the following: ACE & K-Lite mega codecs package, QT alternative, Storm codec, WinAVI video converter, Mpcstar, (possibly starcodec pack, 3ivx)
If so uninstall them, they are know to cause problems with Quickitme. Then download the version of Quickime without iTunes: http://www.apple.com/quicktime/download/win.html Now Remove Quicktime using the method for Quicktime in this article (just Quicktime): XP http://support.apple.com/kb/HT1925 Vista http://support.apple.com/kb/HT1923 When you come to your C:\Windows\system32\ folder you can delete any file or folder with Quicktime in the name. Restart you computer Install the stand alone Quicktime and check if it starts. If it does you are in a position to find out if iTunes is OK.
If Quicktime is OK, do you get any error message when you try to start iTunes? If not, open your task manager after trying to start iTunes. Do you see iTunes.exe running on the processes tab. If there is no error and you see iTunes.exe running then iTunes is hanging and we need to look at a slightly different route.

Sometimes it is just a problem with the itunes database file when it won't open after an upgrade. Press and hold the shift key while trying to start itunes. Does it give you an option to choose or create a new library? http://docs.info.apple.com/article.html?path=iTunesWin/8.0/en/15502.html

Bonjour is a common cause of iTunes hanging at start up. i.e. silent launch failure with iTunes.exe running on the processes tab. You can uninstall bonjour if you don't need it. However it is required for sharing libraries and other things
You could also try uninstalling it, then downloading bonjour from Apple and installing it directly. http://support.apple.com/downloads/Bonjour_for_Windows