Using such tools is generally discouraged due to the high risk of and system compromise. Chew-WGA 0.7, the all-in-one Windows 7 patch | Page 5

: Future Microsoft patches can conflict with the modified files, leaving the PC unbootable. Legal and Ethical Implications Using cracking tools violates international copyright laws.

: It stops the Software Protection Service from checking the license status. Technical Risks and System Damage