help fatal error w/itunes setup

Hello,

I am having problems uninstalling itunes. Originally I was trying to upgrade itunes b/c my itouch would not load up to my itunes while my ipod video would just fine. While trying to upgrade i got a bunch of error messages and then other components of itunes wouldn't work and I would get an error message every time i tried to open itunes (it would still open but i'd get the error message first, plus the itunes store wouldn't load either. all this lead me to try and uninstall itunes, which has become a hellish mission. I have windows xp and i uninstalled itunes through regedit, then i did a search removing all ipod, itunes, apple, quicktime, etc. related material from my computer. the only things that refused to be deleted were the mozilla plugins that had to do w/ itunes and in the control panel add/delete option it will not allow me to remove an itunes setup that went wrong. every time i try to delete it a message pops up that says "there was an error creating a temporary file that is needed to complete this installation." and "Fatal error during installation."

Now, since getting rid of everything but those two files i am trying to reinstall the new version of itunes from apple.com and am getting nowhere. everything is error this or unable to uninstall that... i dont know what to do and i am completely blank on what my next step should be. all i want to do is set the new version of itunes onto my pc so my ipods can sync up properly and all the itunes features work like they should.

Someone please help