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I attempted to update to the latest iTunes 10.1.2 today only to wait for hours on an install that was stuck just 3.5 bars from 100% completion. At first I thought I could remedy this with an uninstall, but I experienced the exact same issue! Imagine my frustration, I could neither install nor uninstall iTunes.
I went to Apple’s KB support site and read that they recommended clearing the Temp folder in Local Settings. That didn’t help. They also recommended an uninstall, which in my case would never finish. I would be forced to turn off the computer just to clear whatever uninstall program was still running in the background when I tried to reinstall iTunes again.
Eventually I found a program called ByeTunes which was a little old but I tried it anyways because I was getting frustrated at that point, and I would have given my kingdom for a horse. It actually did successfully uninstall iTunes but it left me with the same problem of installing iTunes up to near completion and then stalling forever 3.5 bars away from 100%.
I tried installing in safe mode, but Windows simply wouldn’t have it, displaying a
The system administrator has set policies to prevent this installation error which lead me down a whole other path I do not really want to get into.
Finally, I decided I would do the next best thing, and disable all startup items in normal Windows mode and see if that would help. This included all the usual crap that usually shows up in your taskbar icons on the lower right. In the end it turned out it was the McAfee VirusScan Enterprise program that was preventing the iTunes 10.1.2 install from finishing. After a refresh restart and a disabling of the McAfee on-access scan mode, I was able to successfully install iTunes the newest version. The setup will notify you that a prior install did not complete and ask you if you would like to roll back any modifications. Just accept this to proceed.
Just a word of advice in case you hit this problem, you may want to disable your anti-virus program before installing the latest iTunes, perhaps there is some shady virus-like code in there (thanks Apple!) that is tripping those anti-virus filters.