Download a current virus scanner. For this I would recommend Mcafee or F-Prot . They are updated on a regular basis and are fairly reliable. Anyone can get a virus. Don't be offended if someone recommends that you scan for a virus.
Virus infection is very common, anyone can get a virus.
Avoid Virus Myths. Most people think that you get a virus by downloading files. The most popular virii are spread through diskettes. Many virii cannot spread through a modem or a network and require a diskette as a means of transmission. The most common virus is a boot sector virus.