Trojan called SmartService is designed to block a user from running various security programs, such as an anti-virus or anti-malware programs, and also to prevent certain unwanted program’s processes from being terminated. The programs that are blocked are ones whose. files contain certain strings or their executables contain certain digital signatures. Information about the strings and signatures that are being blocked can be found below. An example error message you would see when starting Malwarebytes is: C:Program Files (X86)Malwarebytes Anti-Malwarembam.exe The requested resource is in use.
Source: https://www.bleepingcomputer.com/virus-removal/remove-the-requested-resource-is-in-use-error