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I bought the download version (just for laptop not main PC). Made an USB and ISO install disc. I did a clean install but it wouldn't let me activate with the genuine key. Then found this fix online:
Activate Windows 8 Pro Upgrade
Windows 8 users who noticed that the operating system can’t be activated after the installation may want to try the following workaround that worked to activate when installing Windows 7 using an upgrade on a clean PC.
• 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.
Also missed the start bar so am trying this at moment: http://www.stardock.com/products/start8/
Activate Windows 8 Pro Upgrade
Windows 8 users who noticed that the operating system can’t be activated after the installation may want to try the following workaround that worked to activate when installing Windows 7 using an upgrade on a clean PC.
• 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.
Also missed the start bar so am trying this at moment: http://www.stardock.com/products/start8/