mqrt.dll is a system process that belongs to Microsoft Windows Operating System. It is a part of the Microsoft Personal Web server and responsible for setting up the depth of the queues depending the application and past history of usage. Usually, it starts together with Windows but it is not a core file there. You shouldn't stop mqrt.dll if you want your PC to work normally because it is a safe process that is unlikely to pose any harm to the system.
Security experts warn that mqrt.dll may also be used by malware programs that can be named anything. If suspicious mqrt.dll file is located in C:\Windows or C:\Windows\System32 folder, you are highly recommended to run a full system scan with reputable anti-spyware and remove virus, spyware, trojan or worm that may be hiding under this name. In order to check your computer, run a full system scan with Reimage or anti-malware programs listed below.