Our hardware vendor has sold us a laptop that comes with Windows 7 Pro OEM. Since we want Windows 7 Enterprise (for features like DirectAccess and BitLocker), the vendor has supplied us with a Software Assurance only license to upgrade OEM Win 7 Pro to Win 7 Ent.

Do I need to install Windows 7 Enterprise Volume License media and re-install Windows, or is there a process to turn this existing Windows 7 Pro install into an "Enterprise" ?

  • 1
    Why on earth was question changed 2 years, only to have the tag updated, it serves no purpose.
    – Ramhound
    Commented Dec 19, 2011 at 19:22

3 Answers 3


You will need to do a fresh install (or possibly an upgrade if you wish).

Enterprise is not an edition that is commonly available in shops to the general public and is not covered by anytime upgrade (where you can upgrade editions easily).

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    Took the plunge and downloaded the Win 7 Software Assurance Upgrade ISO and burned it to a DVD. I then put it into the Win 7 Pro laptop (while Win 7 Pro was running) and and ran the upgrade setup - the upgrade told me it was not possible to upgrade this version of windows, so instead it copied the existing install to windows.old and did a clean fresh install. Fortunately HP provided a Windows 7 drivers+applications cd so I was able to reinstall the HP drivers after the new install was completed.
    – ChrisGNZ
    Commented Nov 13, 2009 at 9:17

Upgrading windows 7 between Editions (e.g. "Business" to "Enterprise")

  1. Open up the Registry Editor (Start > Run > regedit) Go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version as seen in the screenshot below 2.
  2. Replace the word “Business” with “Enterprise” in ProductName and EditionID. You’re done modifying the installed copy of Windows 7.
  3. Start the Windows 7 Enterprise installer from disc within Windows and reinstall windows doing a in-place upgrade.
  • Tried and tested. Works fine. Cheers.
    – steve
    Commented Jun 28, 2011 at 9:01

There are various 'Chart's which indicate what's possible. Microsoft's Chart maybe the best

If in doubt I would phone Microsoft Support.

One other thought there is a Windows Anytime Upgrade, but that would like involve extra cost.

  • That chart is for Vista Upgrades, not Win7 upgrades. Commented Nov 12, 2009 at 20:42
  • from my very limited understanding, it appears that Microsoft will only sell the Enterprise version as a Software Assurance upgrade. So it looks like "Windows Anytime Upgrade" is not applicable...?
    – ChrisGNZ
    Commented Nov 13, 2009 at 9:18

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