mrt.exe is the process for Microsoft Windows Malicious Software Removal Tool. This tool can be downloaded as an update (kb890830) and the latest version is 3.20. It helps secure your PC by removing spyware and other unwanted processes. The process mrt.exe is important for safe and secure Internet browsing and should not be terminated.
Non-system processes like mrt.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues