Remove Wat V2.2.5.2 - Windows 7 Activation ((exclusive)) Link

Unlike traditional activators that emulate a BIOS to trick Windows into thinking it has a valid OEM license, Remove WAT takes a more direct approach:

If you prefer not to use third-party software, there are official and built-in methods to manage activation issues: Get help with Windows activation errors - Microsoft Support

Select Start > Settings > Update & Security > Activation , and then select Troubleshoot to run the Activation troubleshooter. Microsoft Support How to activate windows 7 - Microsoft Q&A

Supports all editions of Windows 7 (Ultimate, Professional, Home Premium, etc.) and Windows Server 2008 R2.

The tool alters specific registry entries to trick the system into staying in a permanent "trial" mode while suppressing all activation prompts.