Hp paviliondv2050us wont start

Just repair your windows using provided Windows disk...such files are corrupted due to virus problems.

So repairing it will solve your problem and also you won't loose data.

To complete part one, follow these steps:

1. Insert the Windows XP startup disk into the floppy disk drive, or insert the Windows XP CD-ROM into the CD-ROM drive, and then restart the computer.
   Click to select any options that are required to start the computer from the CD-ROM drive if you are prompted to do so.
2. When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
3. If you have a dual-boot or multiple-boot computer, select the installation that you want to access from the Recovery Console.
4. When you are prompted to do so, type the Administrator password. If the administrator password is blank, just press ENTER.
5. At the Recovery Console command prompt, type the following lines, pressing ENTER after you type each line: md tmp
   copy c:\windows\system32\config\system c:\windows\tmp\system.bak
   copy c:\windows\system32\config\software c:\windows\tmp\software.bak
   copy c:\windows\system32\config\sam c:\windows\tmp\sam.bak
   copy c:\windows\system32\config\security c:\windows\tmp\security.bak
   copy c:\windows\system32\config\default c:\windows\tmp\default.bak
   
   delete c:\windows\system32\config\system
   delete c:\windows\system32\config\software
   delete c:\windows\system32\config\sam
   delete c:\windows\system32\config\security
   delete c:\windows\system32\config\default
   
   copy c:\windows\repair\system c:\windows\system32\config\system
   copy c:\windows\repair\software c:\windows\system32\config\software
   copy c:\windows\repair\sam c:\windows\system32\config\sam
   copy c:\windows\repair\security c:\windows\system32\config\security
   copy c:\windows\repair\default c:\windows\system32\config\default
   
6. Type exit to quit Recovery Console. Your computer will restart.

1. Click Start, click Shut Down (or click Turn Off Computer), click Restart, and then click OK (or click Restart).
2. Press the F8 key.
   
   On a computer that is configured to start to multiple operating systems, you can press F8 when you see the Startup menu.
3. Use the arrow keys to select the appropriate Safe mode option, and then press ENTER.
4. If you have a dual-boot or multiple-boot system, use the arrow keys to select the installation that you want to access, and then press ENTER.

1. Start Windows Explorer.
2. On the Tools menu, click Folder options.
3. Click the View tab.
4. Under Hidden files and folders, click to select Show hidden files and folders, and then click to clear the Hide protected operating system files (Recommended) check box.
5. Click Yes when the dialog box that confirms that you want to display these files appears.
6. Double-click the drive where you installed Windows XP to display a list of the folders. If is important to click the correct drive.
7. Open the System Volume Information folder. This folder is unavailable and appears dimmed because it is set as a super-hidden folder.
8. Open a folder that was not created at the current time. You may have to click Details on the View menu to see when these folders were created. There may be one or more folders starting with "RPx under this folder. These are restore points.
9. Open one of these folders to locate a Snapshot subfolder. The following path is an example of a folder path to the Snapshot folder: C:\System Volume Information\_restore{D86480E3-73EF-47BC-A0EB-A81BE6EE3ED8}\RP1\Snapshot
10. From the Snapshot folder, copy the following files to the C:\Windows\Tmp folder:
    • _REGISTRY_USER_.DEFAULT
    • _REGISTRY_MACHINE_SECURITY
    • _REGISTRY_MACHINE_SOFTWARE
    • _REGISTRY_MACHINE_SYSTEM
    • _REGISTRY_MACHINE_SAM
11. Rename the files in the C:\Windows\Tmp folder as follows:
    • Rename _REGISTRY_USER_.DEFAULT to DEFAULT
    • Rename _REGISTRY_MACHINE_SECURITY to SECURITY
    • Rename _REGISTRY_MACHINE_SOFTWARE to SOFTWARE
    • Rename _REGISTRY_MACHINE_SYSTEM to SYSTEM
    • Rename _REGISTRY_MACHINE_SAM to SAM

1. Start Recovery Console.
2. At the command prompt, type the following lines, pressing ENTER after you type each line: del c:\windows\system32\config\sam
   
   del c:\windows\system32\config\security
   
   del c:\windows\system32\config\software
   
   del c:\windows\system32\config\default
   
   del c:\windows\system32\config\system
   
   copy c:\windows\tmp\software c:\windows\system32\config\software
   
   copy c:\windows\tmp\system c:\windows\system32\config\system
   
   copy c:\windows\tmp\sam c:\windows\system32\config\sam
   
   copy c:\windows\tmp\security c:\windows\system32\config\security
   
   copy c:\windows\tmp\default c:\windows\system32\config\default Note Some of these command lines may be wrapped for readability.
3. Type exit to quit Recovery Console. Your computer restarts.