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Performing a clean install from a Windows 8 upgrade media

If you purchased the Windows 8 upgrade from Windows 7, but would rather do a clean install, here’s a method that I’ve found that has been reported to work.

First, obviously, delete all partitions during the Windows install, supplying your key when requested.

After Windows 8 installs, and if Windows won’t activate, do the following:

Run regedit, and set:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup\OOBE\MediaBootInstall to 0 (zero)

Open an administrator-level command prompt, and run the following:

slmgr /rearm

Then reboot and run activation again.

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