Press and hold “Control-Alt-Delete” on your keyboard and select “Start Task Manager”. You’ll see a long list of processes that you don’t recognize. How can you tell if these are harmless or malicious? Visit exeLibrary to find out. From the about page:

“exeLib is the fastest growing, most accurate, database of executable programs. Each program is stored in the database with some information: the file name, description, the effects, the risk factor, and a few other pieces of information, this information is then displayed to you in a readable, easy to use fashion.”