pc freezing & blue screen

Hello Guys,

My daughter's having some trouble with her pc. it keeps freezing and the Blue Screen of death keeps happening.
Trouble is she lives in Edinburgh and I live in Leeds.
She had her boyfriend and his mate build it.
I said it could be due to her GPU driver and to roll it back to an older version. (196.21) but it still won't play oldish games and starts to freeze. I have also said to check the GPU on her boyfriends friends system. also to check everything is seated properly.
But it's okay when working on word & animation type stuff.
I have asked her the next time an error message comes up to screen shot and send it to me so I have something to work on (google).


Any advise would be very much appreciated.

Thanks

lexus2


windows 7 pro 64bit
Gigabyte Mobo EP43-UD3L Ultra Durable 3
2x 2GB DDr2
Antec 550w Truepower PSU power supply,
G-force 9800GT 1GB Green graphics card,
160 SATA HARD DRIVE
CPU E8400

Repair windows install from the DVD. If that doesn't work download and run memtest.

many thanks will pass on your advise.