7970 issue

[jerethdaminer]

had to reinstall windows due to something causing everything to fall apart.

on a clean instal no change to hardware, every time i try to use my gpu for mining (not tried it on gaming yet)
its locks up the system and i have to do a hard reset.

specs
x4 955 at stock
a4 785td-v main board
8gb ddr3 1333 ram
3x hdds
1x 7970 gpu at 925 core and 1325 ram.
psu corsair gs800
catalyst drivers v13.4
before my system crashed last week i had no problems with any mining
since the reinstall ive had issues all over.

any ideas or help
(added psu stats)