QuickTime fatal error during uninstalling

I'm trying to install itunes on my 3 year old Gateway desktop at home so I can sync my iphone to it and not to my work laptop that needs to be turned in. When trying to install itunes it gives me a fatal error message when trying to update QuickTime. I tried to delete it using Control Panel/Add or Remove Programs and that, too, gives me a fatal error. I tried to remove it using an "Uninstall QuickTime" icon which gives me the option of uninstalling or repairing. I tried both and neither worked.

When I tried to run it using an icon it too gives me an error. I tried to run it using Control Panel. This gave me a different error. It said "An exception occured while trying to run "C:\WINDOWS\system32\shell32.dll,Control_RunDLL "C:\WINDOWS\system32\QuickTime.cpl",QuickTIme".

Applecare suggested I find a board somewhere and tell them my problem and see if anyone there knows what to do.

I'm on XP if that matters.