mcwin.exe is something to do with a program called "Mod Calc", which is a part of what appears to be some business tool by a company called "Smart-Comp". I reckon you would have either installed yourself or, if it's a company computer, the system admins would have.
The other three do not return anything in a Google search, which is very strange. Get a virus scanner as well as the two products dl65 mentioned and scan. I suspect you'll get a clean(ish) bill of health from them but you'd best be safe...