To fix the problem, just run the following command to reinstall APS.NET and reupdated the permissions:

%windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -i

 If that does not work, you can try adjusting the permissions as shown in the following Microsoft article:

http://support.microsoft.com/?kbid=267904

The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2738.

After research I found the following link: 

 http://docs.info.apple.com/article.html?artnum=304405

The solution was to re-register vbscript.dll.  I also selected “Run as Administrator” option when I reran after reregistering the dll.

To register the dll, please do the following:

1. On the Start menu, click Run.
2. In the “Open” field, enter the following command and click OK.
   regsvr32 vbscript.dll
3. A message should appear stating that the “DllRegisterServer in C:\WINDOWS\system32\vbscript.dll succeeded.”
4. Click OK and try installing iTunes or QuickTime again.

Thanks for Apple Support for the posting…

 1)  Keyboad Combination:  You can lock your Windows XP workstation by Pressing the Windows key + the letter L to lock.

2)  DOS Command: You can also lock a Windows XP workstation by typing the following DOS command,

rundll32.exe user32.dll, LockWorkStation

This command can be execute by either click on Start -> Run and typing the in the command, or by creating a shortcut.

3)  Normal way: Click on Ctrl + Alt + Del, and select “Lock”