How to see the current Windows License Key:
1. run ‘regedit’
2. capture Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform\BackupProductKeyDefault

Deactivating Windows License:
1. run Command Prompt with ‘Run as administrator’
2. type ‘slmgr /upk’
3. type ‘slmgr /cpky’ (to clear registry)

Activating Windows from Command Prompt:
1. run Command Prompt with “Run as administrator’
2. type ‘slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx’
3. type ‘slmgr /dlv’ (to verify)