Like many other users, I have purchased the Windows 8 Pro upgrade through the windows upgrade offer and received it for 15$. Once you have the installation media (dvd iso or usb) you can then proceed to do a fresh install. Once you have it installed on new equipment you may have noticed that you cannot activate windows this way by doing a fresh install. But here's the workaround:
oops didn't know there was already a thread on this; however, it'll be like a bump for good measure
- Open regedit by pressing Windows-q, entering regedit and selecting the result from the list of hits.
- Navigate to HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Setup/OOBE/
- Change MediaBootInstall from 1 to 0
- Go back to the start screen and enter cmd there.
- Right-click Command Prompt and select to run it as administrator.
- Type slmgr /rearm on the command line and hit enter.
- Reboot Windows now.
- Run the activation utility afterwards, enter your product key to activate Windows.
oops didn't know there was already a thread on this; however, it'll be like a bump for good measure
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