Ati radeon hd 4850 driver update problem

I'm having some problems with my ati radeon hd 4850 graphics card i bought it about a year ago and now it started to act up...for example i try and play a game(any game) and after a minute or so the screen gets all blury and eventually it goes black and i need to restart my pc.I went on
and there isn't even an ati hd 4850 series in there only 4800 and 4890(i have windows xp pro) i also tried
and still it didn't work...i've been trying every single update for it and it still doesnt work.The next thing i can do is either buy a new graphics card and i dont wanna do that just yet.So if anyone can help i'd really appreciate it.
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More about radeon 4850 driver update problem
  1. Check your temps card first to find out whether this is an overheating problem or not...
    Also, list the rest of your system here...
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