Good anti-virus freeware
Good protection against viruses does not have to be expensive. Some free programs that have won recognition for their anti-virus capabilities are available for you to download for free. Try Avira AntiVir Personal Edition Classic. According to one reviewer:
AntiVir’s scans are flexible, allowing the user to fully scan all hard drives, choose a preloaded scan–for rootkits, for example–or customize a scan… The quarantine is extensively thorough, too… The help features in AntiVir were excellent, with a description box relaying mouse-over information on each feature. AntiVir’s volume of features might take a while to get used to, but as long as the definitions file updates keep coming, this app’s a keeper.