Weird computer problems

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Kitten:
Every few days (about once every week, perhaps) my laptop starts showing blue screens saying physical memory dump is starting. After a couple of seconds, the computer restarts. This occurs more and more frequently over the next 48 hours, until eventually the screen beeps, freezes and a blue screen with illegible white lines appears. The computer then re-freezes.

To fix the problem, I tend to run an error-check, which doesn't fix the problem, uninstall AVG 8.0, which doesn't work and then defrag, which does fix the problem.

Any suggestions as to the real cause of the problem? This has been happening for about two months.

It also occurred a few times a year ago, and when sent to IT services, they said there wasn't a problem. Since then, the laptop got windows xp reinstalled due to an unrelated problem, and two months later, this started (about the same time, the original virus software ran out of date and was removed (properly) by me.

Any help greatly appreciated as I can't afford the £30 handover fee for professional support. Nor do I wish to get professional support: it tends not to be much use.

kewian:
How much memory do you have left? 

Kitten:
I have 1Gb of memory, half of which cam with the laptop. I'm reluctant  to buy more though, as to upgrade further, I'd have to discard one of current memory cards and replace it. (Thus having to buy more memory than necessary)

Simsample:
There are lots of causes for a physical memory dump. Driver errors, software fault, even faulty RAM. The first thing I'd do if I were you is to check the event logs to see what errors are recorded there.

Kitten:
How do I do that?

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