Windows vista - windows 7 upgrade - oem issue

I have just tried to upgrade from vista ultimate 64bit to 7 ultimate 64bit, but I cant because my vista is oem. Is there a way around this?
Can I uninstall vista and still upgrade with the upgrade disk?
Will I lose all my data or is there some solution.
I did not know I had the oem version.
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More about windows vista windows upgrade issue
  1. You should be able to do that upgrade. Are you sure it's not 32 bit to 64 bit? What error did you get? I would backup all data before any upgrade... I would do a clean install if possable.
  2. It should not matter that your Vista is an OEM version, you should still be able to upgrade from Vista Ultimate to Windows 7 Ultimate (if you are going from 64-bit to 64-bit). You can choose from doing an in-place upgrade (which will keep your files, programs, and settings intact) or a custom installation which will wipe your computer and allow you to start fresh. Either way, it's a good idea to back up anything you wish to save before upgrading. Visit http://windows.microsoft.com/en-us/windows7/help/upgrading-from-windows-vista-to-windows-7 for a guide to help you through the installation process.

    Cheers,
    Cassandra
    Microsoft Windows Outreach
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