Currently Being ModeratedJul 12, 2012 10:04 PM (in response to drsfx)
Repair your QuickTime.
Control Panel > Programs n Features > highlight QuickTime, click CHANGE then REPAIR
Currently Being ModeratedJul 14, 2012 9:46 AM (in response to wiclee)
Tried that, didn't help. I then un/reinstalled quicktime and still no luck.
Currently Being ModeratedJul 14, 2012 10:30 AM (in response to drsfx)
Check if you have the latest version of QuickTime 7.7.2.
If that still does not work, check if you have enabled wifi sync. If so, disable it and try again.
See if this article will help also:
Troubleshooting iTunes for Windows Vista or Windows 7 video playback performance issues