how to know whether my computer has virus or not?
Everyone's computer will run slower while it's copying files. You're reading files from one area of the hard drive, processing them, and writing them to a new area. If you want to experience less of a slowdown, you can either add more RAM, get a new computer, or a faster hard drive. But I don't believe you have a virus.
Spyware will definitely slow down a PC to a crawl.
Try a full scan with Malwarebytes and fix all it finds. Also, uninstall any trials etc on your PC that you aren't using.
If your PC is fairly new, I wouldn't suspect it to be a ram problem as they are quite well loaded when you buy them.Some HELP in posting on Computing.net plus free progs and instructions Cheers
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