Illegal Instruction? - Any ideas?

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Okay, I've unzipped Sundays version (before I fixed the slowdown issue) and the crash is still happening. Now, that version definitely wasn't crashing on Sunday because, as I said above, I was running it for 20 minutes at a time to track the slowdown.

Looks like the ATI Catalyst drivers might be the culprit.

Now I think of it, IE crashed a few times yesterday as well.

Is there anyway to get hold of old catalyst drivers?