Also, did you download and run any executables from unreliable sources? I would say that you should use your task manager (I am assuming you're using windows) to make sure that all the programs that are currently running are trustworthy. You can just google the executable name, and it usually takes you to a microsoft, your PC manufacturer, or some other website that tells you whether the program is a virus or not. If you cannot do this, then I would reinstall the OS. If your computer has been compromised, then reinstalling it should do the trick. And from next time onwards, you need to run an updated virus scanner before running executables.