No .mov files play

I upgraded to Pro from version 6 to 7 and now no .mov file will play. Not even the main trailers for movies on the quicktime page plays. Everything worked fine until I upgraded. I've tried .mov files all over the internet and my computer and none of them will play, I just get a flickering screen, usually a brownish color.

By the way, I just tried to view my Quicktime info from the system tray icon and got the following error:
Error signature
AppName: qtinfo.exe AppVer 7.1.0.210 ModName: usbmn2x2.dll
ModVer: 0.4.1.14 offset 00001f57
I've already uninstalled and reinstalled with the Quicktime only install file and rebooted.

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