How often do you run a virus scan on your computer?

Canada
@bayernfan (1430)
March 31, 2009 7:14pm CST
How frequently do you scan your system for viruses? Do you do scans online or offline? What program do you use? How well is it working for you? Is your computer infected with viruses often? I scan my computer at least once a month. I use Avira AntiVir. It is excellent at identifying any potential difficulties. I haven't had to contend with virus removal on one of my systems in years (*knocks on wood*).