Youtube videos lag/freeze on full screen when mouse is inactive, but only in firefox.

I absolutely HATE IE, so I hope we can find a solution to my problem.
Pc info: Win 7 64 bit, 2.9 pentium with 4 gig ram
video: radeon HD 3800
Three days ago I was infected by some malware. While i had it i could not watch videos on youtube in full screen unless i constantly moved my mouse. I uninstalled the malware and it didn't help. I reinstalled videos card drivers (even tried the new beta drivers), firefox, adobe flash, java 32 and 64 bit, and performed these steps: http://techlogon.com/2012/06/04/flash-player-crashes-in-all-web-browsers/
I've reset Firefox, emptied cache in Firefox, and manually deleted all program temp folders I could find. Also, I have disabled all add-ons and plugins, and even ran Firefox in safemode. Nothing seems to work.
There may be a few things I've forgotten that I've tried.

well, in windows safe mode, it seems to play the video in full screen without the mouse moving, but while playing (normal or full screen) it either restarts the video several times or straight crashes the player.

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