Test your Antivirus to see if it’s actually working creating a fake Virus with Notepad. How? Open notepad and copy-paste the next line into it:
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
Now try saving the document, your Antivirus should notify you that a virus (a harmless virus actually) has been detected (as long as you’ve got antivirus installed and working,).
Here are a couple of popular Antiviruses: ESET NOD32 Antivirus, Norton Antivirus 2011, ZoneAlarm Antivirus.