Yup. In the general sense of the term "virus" (any malware that can be installed on a computer), there are some kinds of malware, usually called downloaders, which can actually download more malware...
Use a good antivirus to know if you have a virus. Examples are: Avira uit Duitsland avast! uit Tsjechiƫ BitDefender uit Roemeniƫ Computer Associates uit de VS ClamAV - GPL ClamWin - GPL ClamAV voor...
if you want to remove a virus go on full system scan and go on scan detials and where it says disinfect and quarentine go on the drop down window and click remove... i hope this helped