Do you use any tools to overclock your graphic card like evga precision or msi afterburner? If yes, try to lower/disable overclock and try again.

If not, you can try to monitor temp of you graphic card with msi afterburner (without overcloaking) and see if temps is raising really fast when you try ccminer.

Else found this on google with purple screen on boot: http://answers.microsoft.com/en-us/windows/forum/windows_8-system/windows-8-shows-a-blinking-purple-screen-after/0babde4b-c070-4976-a7c0-c073207ba194 http://answers.microsoft.com/en-us/windows/forum/windows_8-system/windows-8-shows-a-blinking-purple-screen-after/0babde4b-c070-4976-a7c0-c073207ba194 it's on windows 8, but user found that without avast problem was solved. Perhaps somethings you can try

If nothing work, a clean install of windows/reinstal of updated driver is the last solution ^^

Avast you say? I have avast on my PC.