Not completely sure. But if you think it is an iTunes issue...... follow through this: Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
ALSO, if you feel like all your music will be gone as well follow through these 2:
IF YOU THINK ITS A COMPUTER ISSUE, RESTART YOUR COMPUTER BEFORE DOING ALL THIS.
Thanks for the help.
thought it could be a compatibility issue, Troubleshooter on my computer says itunes is incompatible but i am not sure for what.
Also when i downloaded itunes quickTime never installed on my computer i have uninstalled and reinstalled several times and the same things are still there.
My itunes worked perfectly until i had to install the new one.
I did had a similar issue like this before caused by uninstalling and reinstalling itunes..... i just don't remember much.
See if this is any help: iTunes for Windows: How to turn off Compatibility Mode OR Windows 7 Fourm: iTunes compatibility mode problem