Repeated BSODs while browsing, gaming, etc. on XPS 9100

Hey all,

Hoping you can make sense of why after about a year of no problems, I am now getting repeated BSODs while doing a wide variety of high, medium, and low memory tasks on my original-install OEM Win 7 Home Premium x64 Dell XPS 9100.

I suspected graphics drivers since the problems started up after updating my ATI drivers for my HD 5670. I ran all kinds of memory diagnostics and everything seemed OK. I uninstalled the driver and ATI Catalyst Install Manager, rebooted in safe mode, ran Driver Sweeper, ran CCleaner, rebooted, reinstalled an earlier ATI driver version, and everything was okay for about a week then the BSODs started again today.

Thanks in advance!

I should also add I suspected the ATI drivers because some of the BSODs mention atikmpag.sys, and the monitor occasionally distorts/freezes up with no BSOD and the only solution is a hard reset.