Need to see more of your dump log but I have a pretty good guess.
I'd say your AMD/ATi drivers are corrupt. I'd uninstall them from CP, restart into safe mode, Run (Display Driver Uninstall -or- Radeon Removal Tool -or- Driver Sweeper(older)), restart, install drivers fresh.
http://support.amd.com/en-us/download
AMD's uninstall method:
http://support.amd.com/en-us/kb-articles/Pages/GPU57RemoveOldGraphicsDrivers.aspx
Catalyst Uninstall Utility (seems to be removed from AMD's site now)
http://www.techspot.com/drivers/driver/file/information/16748/
http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
http://www.guru3d.com/content_page/guru3d_driver_sweeper.html
Safe Mode w/ Networking if you get into trouble. Likely just Device Manager remove the display adapters restart.
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Power Supply isn't like a 250w or something is it lol?