What should I do if I forget my key after win7 Ultimate is permanently activated?

It can be retrieved through the registry.

1. First turn on the computer and click "Run" in the lower left corner to start the menu bar.

2. Then click enter "regedit" in the pop-up window and press enter to confirm.

3. Then find HKEY _ Local _ Machine/Software/Microsoft /Windows in the pop-up window? SoftwareProtectionPlatform project in NT/CurrentVersion.

4. Then find the key value of "BackupProductKeyDefault" in the pop-up window on the right, followed by "Activation Key".