SpywareBlaster is a killbit software for Microsoft Windows that blocks the installation of most ActiveX-based spyware, adware, browser hijackers, dialers and other unwanted programs from the user's computer. SpywareBlaster works by blacklisting the CLSID of known malware programs, effectively preventing them from infecting a protected computer. This approach differs from many other anti-spyware programs, which typically offer the user a possibility to "scan" the memory of the computer and remove the unwanted software, after it has been installed.