Thanks mcnumpty for the help. I ended up finding this forum:http://forum.overclock3d.net/showthread.php?t=44734
no need to reinstall, there is a very simple fix for this,
i had the issue an this fixed it perfectly for my 670
Deus Ex: HR
and change the 0 to 1, save and close regedit.
play deus ex hr working properly