I checked the dump files, but I am not that experienced with such things. As kemical mentions the video driver seems to be getting caught most often. It happens during several different processes that that I saw in the files I analyzed. Twice is was the Desktop Windows Manager, once during mpc-hc64.exe, which looks to be a video player of some type, and once during NexusClient.ex.
I am not sure if these dump files were taken after you reinstalled, but when troubleshooting, I usually load only basic software initially for testing, then add software that might be involved after I have confirmed a stable system prior to their addition.
I did find one thing I don't think kemical mentioned, but I don't have an ATI card so it may be...