Help with installing an Radeon HD 6950

I've spent awhile trying to assemble this myself but I can't seem to find anything else to try. I apologize for links but I figure its the easiest way to show all of my computers parts.

This is my current computer http://www.newegg.com/Product/Product.aspx?Item=N82E16883229194, with the only modification being this http://www.newegg.com/Product/Product.aspx?Item=N82E16835118223 replacing the fan it came with.

I ordered a Radeon HD 6950 to replace my ATI Radeon HD 5450. I was able to remove the 5450 from my PC and replace it with the 6950. After installing the drivers on a CD that came with the 6950 I tested it out by trying to play a few games on Steam. They were incredibly laggy and much worse than my original card.

When I look under Device Manager-Display Adaptors it shows "ATI Radeon 3000 Graphics." When I removed the 6950 and put back in the 5450 it correctly named the card.

If anyone could please help me get my 6950 to run, I would appreciate it. Thank you for any help.
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More about help installing radeon 6950
  1. get driver sweeper
    http://www.softpedia.com/get/Security/Secure-cleaning/Driver-Sweeper.shtml

    us it to remove all old drivers and get the new drivers from AMD.com
  2. When I downloaded Driver Sweeper, these were my choices. http://imgur.com/LXvqx

    I cleaned all the drives under AMD-Display then went to amd.com and downloaded new drivers but it still isn't working.

    Did I delete the wrong drives or did I not delete enough?
  3. delete the nvidia ones too
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