For those looking for alternatives, Windows includes built-in maintenance tools, or you can explore highly-rated options like uFlysoft Registry Cleaner manually clean your Windows registry without using third-party software? Is WinThruster useful at all? - Tom's Guide Forum
To activate WinThruster with a new activation key, follow these steps: winthruster activation key new
Difference between product key and activation code - Microsoft Support For those looking for alternatives
If you have already purchased a key but cannot find it, checking your email for a receipt from the official merchant is the most reliable method. Microsoft Support Better Alternatives Windows includes built-in maintenance tools
A: Only if the BSOD is caused by a registry misconfiguration—which is rare. Most BSODs are driver or hardware related.