Can anyone give me some help please?

Since last week, I have not been able to play videos in full-screen mode on YOUTUBE or BCCi player. Most of my Mpegs I have saved to my PC seem to work though. (This seems to have happened since i defragmented)

I have an ACER Aspire 57207 on Vista.

Any help would be much app'd!

STOP DOUBLE-POSTING!
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