Report MoUSO Core Worker Process in General Windows 10 Support Posted July 2 Hi @fcb - That appears to not be something you need to worry about. My guess is, your system is doing an update of some sort. Here's some additional detail from groovyPost.com https://www.groovypost.com/explainer/what-is-mousocoreworker-exe-and-why-is-it-running/ Quote MoUsoCoreWorker.exe is a replacement file for wuauclt.exe related to Windows updates. A long and complicated name for a file, the part of the file name ‘Uso’ stands for; Update Session Orchestrator. The file is located in C:\Windows\System32. In short, it is a Windows system file.