How to activate windows 7 64 bit over vista OEM

i have a Gateway laptop (FX 7811p) that came with vista home premium 64 bit. i have been trying to do a clean install of win 7 pro 64 bit, as i was told that an upgrade over vista is not possible. now, my problem is that i can't activate my product. i tried the win 7 key as well as older vista keys but i keep getting an error (0xC004E003. i am getting frustrated now. please HELP!
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  1. Where did you get your window 7?
  2. Anyway... if you did a clean install it has nothing to do with the Vista, which was previously installed /it's not "over" it/.
  3. Welcome to Tom's Hardware:

    The error code 0xC004E003 simply means that the Software Licensing Service reported that license evaluation failed.

    Here is what you need to do.

    1. Press the WINKEY+R to bring up the Run dialog box.

    2. Type SLUI 4 in the box and press OK. This will start the Telephone Activation Wizard.

    3. Select your country in the drop down menu and click the Next Button. Follow the instructions on the screen and call the number that is shown there.

    Follow the recorded instructions and when the telephone activation fails, stay on the line and an Activation Representative will answer. Just describe the problem you are experiencing and they will manually activate the system for you.

    Hope this helps.
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