Using a cracked Windows 7 today is like driving a car with no brakes, no airbags, and a broken speedometer—while also having a thief in the back seat (the activator malware). The WGA notification is the least of your problems.

If you have already installed a WGA activator and suspect malware or system instability, follow these steps:

These tools are not official Microsoft software and carry significant risks regarding security, legality, and system stability. What These Tools Do

sfc /scannow