Backward 7's

For about 6 months as I surf the web, different pages on the internet, the text on the screen suddenly turns to what looks like a lot of little backward 7's or a foreign language such as Hebrew. The headline text dous not change, just the little text under it. If I wave the mouse cursesr over the text it changes back to the correct text. It's driving me crazy. about 6 different tech's have different idea's what is wrong and none of them worked. One of them had me alter the system registry which of course resulted in that I had to reformat my hard drive and re-install everything but the backward 7's did not go away. Can anyone help?????? George