The link below is point to the Microsoft Crash Analysis page:
I don't know if it's useful, but I included it incase it is.
Just under 2 months ago I replaced my Radeon graphics card with an Nvidia Geforce 6200. Could this be causing the problem? or is it more likely to be something else?
On Friday I switched the hardware acceleration off. I went through Saturday and Sunday crash free, but it started crashing again today.
Thanks in advance for your help - it's really appreciated.