 On your PC, open the Task Manager. On a Mac, you're going to open Activity Monitor. Then there, you're going to see all the apps and background processes that are running on your computer. Look through the list. Now, if you see a name that you don't recognize, just search for it online to see what turns up. But let's say that you do see spyware on that list. You need to remove it, and that may mean, oh, I know, it's a lot of work. Backing up your system, reformatting the drive, reinstalling everything, definitely no fun at all.