| try to uninstall itunes,
then after that clean your temp files (delete it)
download msicuu2.exe on microsoft website and try to clean the system with all apple product,
after that reboot system ...
then intall again the latest version of your itunes...
(you can see temp folder if you let all the hidden files shown on folder option)
if you are computer user i think everything is easy to do...
gudluck |