Radeon HD 6850 DX11 issues

[yodazb]

I just upgraded my friends system from an 8800 gts to a Radeon HD 6850. I uninstalled the nvidia control panel, and continued to install the CCC. I installed the CCC and got it set up. I had no issues. Then I went to start a game and nothing but a critical error message about DX 11. I tried updating DX 11 and also reinstalling CCC. I also ran dxdiag and it shows there are no issues with DX11 noted. But no games will open because of this issue. If anyone could help I'd appreciate it.
Thanks, yodazb

 

[Daywin]

what os may I ask?