If you have any trouble uninstalling and reinstalling itunes you will want to check out this link...
It can keep you from going nuts and is worth it!!
There are some very positive comments at the end of the post be sure to read:
http://zardozz.com/zz/2008/04/how-to...of-itunes.html
It can be found here:
http://rockbridge.payloadz.com/produ....asp?Id=514696
Worth taking a look if all else fails or you just want to fix the problem without doing a lot of research and wasting a lot of time fixing your registry area!