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PresterJohn - thanks for letting me know about the new NVidia drivers - I'll download them at the next convenient opportunity.
agathodaimon - this only started happening about a fortnight ago. I've owned the computer for about eight months and up until this problem started nothing had gone wrong that couldn't be solved reasonably easily (i.e. disk errors, nothing major).
Both of you mentioned trying out another graphics card - I should be able to do this at some point, but probably not within the next week or so (the guy I know who has plenty of spare computer parts is a hard man to pin down).
In the meantime, I've had it suggested to me that the cause of the problem might be dust or overheating, so I opened up the computer and had a look around. The fan for the graphics chip had a lot of dust in it, so I cleaned it out and the computer has been fine since I turned it back on. I'm not going to get my hopes up however as sometimes a few days pass between incidences of this problem.
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