Computer keeps turning off randomly Atikmpag.sys

I have recently reinstalled Windows 7 and my computer screen just
randomly turns black, my monitor says "out of range" and then "No
signal", and then it just restarts itself. This has happened 3 times
in the last 2 days and blue screen view says its due to Atikmpag.sys
dxgkrnl.sys, and dxgmms1.sys. What is wrong with my video card or

I have an ATI HD Radeon 4850, with catalyst drivers 12.1 not 12.2 or 12.3 because these are more stable.

I will attach mini dump files.


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