Found the following...
I'm not upgrading again.
Currently Being ModeratedFeb 3, 2013 5:23 PM (in response to ninobravo)
You can but it is difficult this is one way to do it reformat hard drive, re-install windows and download it from here http://www.oldversion.com/windows/itunes-10-6-3-x64 ,I actually had my hard drive fail recently and replaced it.
re installed iTunes 10 and turned off automatic updates.we are not alone on this google search "revert iTines 11 to 10" returns About 664,000 results (0.44 seconds)