While the temptation to get a premium utility for free is understandable, searching for a "free WinThruster license key" is a high-risk endeavor with low reward. The likelihood of infecting your computer with malware is high, and modern Windows systems rarely require third-party registry cleaners to function optimally.
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: Use the free version of Malwarebytes to scan for and remove actual performance-draining malware or PUPs like WinThruster itself.
Using modified software bypasses security checks, leaving your system open to attacks.