Problems running games - slow graphics redraw

  Gothdj 23:19 22 Jan 03
  Gothdj 23:19 22 Jan 03

I have, in the past week, suddenly developed problems running games (such as FIFA 2002), due to v. slow grpahics redraw, so the action becomes v. jerky and renders the game unplayable.
I have been playing games without any problems until this week, and the fault has suddenly developed.
Spec: W98, 500Mhz, 128Mb Ram, 20gb hard disk of which 3-4 gb is free.
Yes, I know not state of the art, but as I say, I have not been having problems until now.
What things should I check, and in which order?

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