I am planning on moving to Windows 7. The machine currently have Vista Ultimate (x32) OEM running on it. I have already run the Upgrade Advisor and the machine meets the system requirements for a 64 bit Windows 7.
I want to use Windows 7 Professional (x64) OEM disc to do a clean install (wiping out everything/partitions and recreating them).
Can I do that? Is it allowed? Is it legal?
Read our Windows 7 Activation FAQ. As long as you delete all of the partitions and do a full fresh install (which you said you want to), it should work fine if you purchased a new OEM license key. OEM licenses are not transferable though. If you purchased a brand new OEM license you can use that media to do a fresh install, but if you say have a copy of Windows 7 on a different computer and aren't using it, you can't move it over.
If you have a retail or upgrade license key, you can still use the OEM install disk, but you may be required to call the Microsoft activation hotline to verify the product key if you use a different install disk type from your key.
You can install windows 7 Professional if you purchase a license.
it will work for you if you do install it but in the future you might have later licensing errors, basically it is not legal to install without a Windows 7 Pro license.
Since you haven't purchased a Windows 7 license, you are not eligible to install Windows 7 Professional on your machines. It's as simple as that.
The Upgrade Advisor does not check for your valid Windows 7 License, so that doesn't really matter.
Paying no regard to the legalities (for which insufficient information has been provided anyway) It is perfectly possible to perform a clean installation from an OEM Windows7 (64) disc as long as it has not been activated on another machine.
