I strongly agree with Intel chips. As far a graphics cards, It was best said by GT11. NVidia seems to be a better all around gaming card, where AMD seems to be more of a specific game/s type card, to be better/equal to NVidia.
Neither are bad choices and always, always, spring for the best you can possibly afford. I too have a AMD 7950 as GT11 and love it! I tend to be biased towards AMD cards, as I have not had issues at all and can match performance with the same class NVidia's.
Rek hit the nail on the head... Always uninstall your drivers first through "add/remove programs", then check that these folders do not exist. If they do, delete them.
C:/AMD/support/14-4-win7-win8-win8.1-64-dd-ccc-whql
C:/AMD/support/14-4-win7-win8-win8.1-32-dd-ccc-whql
Personally, I've never deleted these folders, as they seem to be removed during uninstall, but that may not hold true for everyone.
For the latest drivers, go here...
http://support.amd.com/en-us/downloadOn the right side, under "Latest AMD Catalyst™ Drivers for Radeon™ R9 200, R7 200, HD 7000, HD 6000 and HD 5000 Series", just click on your version of Windows (32 bit, or 64 bit) and it will bring you directly to the download link. See pic below..
I would stay away from the beta drivers, unless your comfortable working with computers. They can sometimes cause issues, that even may require temporarily changing BIOS setting to go back to working drivers.