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![Super User](http://cdn.sstatic.net/superuser/img/apple-touch-icon.png)
If you want to use your license on a clean install, you need to backup and restore your activation files.
Backup the folder located here: %WinDir%\System32\spp\store\.
To uninstall a key, right click on the Start corner > Command Prompt (Admin) > Yes > Type:
slmgr -upk
Actually, there is no...