If you are facing this problem right now, don't worry. However, sometimes the services.msc can not start or suddenly stop working. Normally, you can easily open this app by typing services.msc in the taskbar search box or the Run dialog box.
Services.msc is a service management application built in Windows that allows you to start, stop, or disable services installed on your PC.
Services.msc Not Opening in Windows 10, How to Fix This Issue