Desktop is multicoloured!! :S and screen flickers!! :S

[nomputer coob]

I have an intel core 2 duo processor t5500 (1.66 GHz),
80 GB (serial ATA/5400 rpm) hard disk drive,
1 GB DDR2 main memory,
vaio VGN-C25G/G,
with NVIDIA GeForce Go 7400 GPU
and im running on windows vista home premium.

and my desktop has a rainbow effect on it and the screen starts shaking to the top.

[Mulreay]

Could be a temp issue. Are you using something graphics intensive when this happens?

[Broni]

Does the same thing happen in safe mode?