My pc was alredy upgraded to windows 7 home premium to professional

Hi

One of my pC has been purchased with Windows 7 Home premium in my office. it was upgraded to home Premium to professional. Due to BIos setting Corrupted i restored the system to previous version.the system taken the HOme premium only.How can i revert back to 7 Professional?
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More about alredy upgraded windows home premium professional
  1. upgrade it again to the pro version.
  2. Use pro media and the pro key to reinstall.
  3. If you have a legal Win 7 Pro license (product key), you may be able to perform a Windows Anytime Upgrade with that info.

    Go here for more info: http://windows.microsoft.com/en-US/windows7/products/features/windows-anytime-upgrade
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