Graphics card error?

Hi guys,

 

My machine has been playing up lately. It has started to be very slow of late and now and again it just restarts itself. I did get an error last time this happened which was:

 

"The driver for the display devive was unable to complete a drawing operation. Please check with the device manufacturer for a driver update.

The display driver for NVIDIA RIVA TNT2 Model 64 seems to be responsible for the system instability."

 

Ive had my machine ages and never had a problem with this card or the drivers for it, does anybody know what i can do about this and where i could get any driver updates i need?

 

Thanks