Download Malwarebytes and run it immediately. If it is not malware, it won't hurt anything. If it is, it may catch it before more malware infects other programs.

Do a full scan, and if it finds anything, run it a second time. If Malwarebytes won't install for you, you probably already have an infection. I ran into that on one machine, where the malware is smart enough to disable malwarebytes. Changing the filename to a .bat from .exe in turn fooled the infecting program.