300 EAC for anyone who can help me fix my problem.

I recently bought another Asus HD6950 DCuII to add to my rigs. I got it from a gamer who kept it on water and did overclock (R 1400 USA equivalent of $140).
I have it on Asus m4n72-e on its own as my other rigs are full.
Had windows 7 64 bit (cgminer would just crash)
Then clean installed Win 8 64bit (cgminer would still crash)
Reinstalled Win 7 64 bit (cgminer crashed again)

No error msgs just starts and then exits

I have the same drivers for all of my rigs

13-12_win7_win8_64_dd_ccc_whql

AMD-APP-SDK-v2.9-Windows-641

Tried the card on another rig still crashed cgminer.

i have tried guiminer as-well still no luck.

I also tried a basic line
cgminer.exe --scrypt -o stratum+tcp://stratum01.hashco.ws:8888 -u xxx -p xxx

Using cgminer 3.5.0 and 3.7.2

Driver is working because i can run MSI kombuster with no problem

any help will be greatly appreciated and will pay anyone 300 EAC for the solution.