If you need to clean your computer of unused files and junk. It would be good to run CCleaner to get rid of stuff that could be slowing down your computer. There is a free basic version that you can use. You just have to run it a few times to get ride of all the files cause there is a limit on how much it will clean for free. try it you just might find your computer runs faster. 

If you think you got a virus, well I got the perfect program for you. Just download Malware bytes and run this on your computer. It will not only tell you that you got a virus it will help you get ride of it.