Well, you could download and install AVG antivirus along with the latest reference files, and run a scan and find out. AVG is a free AV program, and it performs very well. They keep up on the updates even with the free version, although they do offer a pay version with a few more features, and a better interface.
Go here to download AVG Free version:
http://www.grisoft.com/us/us_dwnl_free.php
They do ask you a few questions on how the software will be used, and they do require a valid E-mail address to mail you a liscensing key.