I've had issues the last few days with my windows XP SP3 system freezing up- I eventually worked out it started after i messed with display settings, and turned off write combining. Freezes often occured RIGHT after the log in screen, though sometimes i got the system running up to half an hour before it froze. I had this issue in VGA mode, safe mode with networking, and standard boots, while, thankfully, standard safe mode worked.
So, my question is, what is write combining, and why would turning it off cause display freezes?
The system is a thinkpad r61, with a intel x3100 graphics card.