Msvcrl.dll is a mass-mailing worm W32.Looksky.A@mm. Msvcrl.dll opens a back door on TCP port 321. Msvcrl.dll tries to terminate antiviral programs installed on a user computer. Related files: %Windir%\sachostx.exe %System%\msvcrl.dll %System%\sachostb.exe %System%\sachostc.exe %System%\sachostp.exe %System%\sachosts.exe %System%\sachostw.exe %System%\sachostm.exe Adds the value: "HostSrv" = "%Windir%\sachostx.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove msvcrl.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.