Flashing screen when mouseover on URL's, or expand some AJAX menu

Hey,
Sometimes when i mouseover on link, or some ajax elements (e.g. Facebook notifications drop-down menu) my screen is flashing, very quickly in something like this: normal-black-normal. Cycle takes less than one second, and i dont know what's wrong...
Can u help me?

I'm pretty sure your problem is a "in user account" issue of some sort.
What I suggest you do is systemmatically run through this list of fixes, I suspect the #6 and #12/#13 would be the ones that will resolve your described issue, but you also could be having other issues wrong with the machine.
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As a last restort you could copy your files to a new User Admin account.
Combine two+ Users Accounts on the same machine
Also run through this to find any performance issues before they become a problem
Why is my computer slow?

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