Must two sticks of RAM in there. You could take out a stick and see how it works, if it still freezes swap the memory over. You would have to do this for for each memory slot as it might be the memory slot is faulty rather than the RAM simm. If it still freezes you will have probably eliminated the RAM as causing the problem (it's unlikely that both simms have developed a fault).

I've had similar problems with freezing caused by dodgy device drivers for the Video card and a failing PSU.

Of course you have to happy about furtling around in the inside of you PC as the RAM simms may not be very easy to get at and don't forget:-

1.to make sure the pc is off and disconnected from the mains

2. You are earthed (touch a radiator or wear a earthing bracelet) before touching anything inside.

Iirc it is 2 x 512mb a 1 x 2gb, but I could be wrong, I did it myself so checking won't cause a proble. The ironic thing is, it hasn't freezed during the last couple of days, but if it does again I will try and switch the memory.

Too much pornography me thinks

Too much pornography me thinks

:no:

Honestly jsut leave it running memtest x86 overnight.

Get a prebuilt ISO from the link below, burn it, then put it in the PC and start it running before you head off for the night. In the morning you'll have an answer:

http://www.memtest.org/#downiso

I'd check the ram like the other guys have said, do you notice any graphics corruption etc when your machine crashes? any hard disk activity when it locks?