completely uninstalling itunes on windows pc?

I'm not very used to using windows, I normally use a mac, but recently I've had to. iTunes on my windows xp computer isn't working so I tried to reinstall it, that didn't work so I deleted it from program files and tried to delete it in "add or remove programs" on control panel, but both when I tried reinstalling and deleting in add or remove programs it says "invalid drive e" followed by fatal error during installation. Is there another way to completely uninstall and reinstall itunes and remove it from the start menu?
Naomi — I already tried that, which if you read my full question you'd know, but thanks anyway.