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In case you have Windows 7 Enterprise (x64 or x86)

It is actually not that difficult to flip from Windows 7 Ultimate Machine or VM to Windows 7 Enterprise (you just need to modify the registry keys to reflect it), and then use the Windows 7 Enterprise DVD to run an upgrade.
First you should of course backup your data.
Here is a quick hack to make the Windows 7 installer DVD think you have Windows 7 Enterprise already.
  1. Open regedit (Start -> Run -> regedit )
  2. Locate HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version
  3. Edit two keys to say ProductName and EditionID to say "Enterprise" instead of "Ultimate" respectively.
  4. You should now see Enterprise and Windows 7 Enterprise as values on this page.
  5. Insert your Windows 7 Enterprise DVD and run an Upgrade install.
  6. Open a Command Prompt and Run "C:\Windows\system32\slmgr.vbs -ckms" to clear any KMS servers
  7. Optionally clear your product keys with "slmgr -cpks"
  8. Run "C:\Windows\system32\slmgr.vbs -ato" to register with your Enterprise Activation server
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12y ago

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