slmgr /ipk <YourProductKey>
This command can be used a total of , providing 120 days of use including the initial month. Advanced One-Year Extension : how to activate windows vista without product key
Wait for the confirmation dialog and then restart your computer . slmgr /ipk <YourProductKey> This command can be used
If you have a lower edition of Windows Vista and want to upgrade to a higher edition: slmgr /ipk <
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SL in the . Find the SkipRearm key and change its value to 1 .
Right-click the Command Prompt and select Run as Administrator . Step 3: Type the command slmgr -rearm and press Enter .