There are a lot of anti-virus software options out there. The one thing they most of them have in common is that they cost money. But Avira is offering a fully functioning version of the their AntiVir software for free. You get anti-virus protection, malware protection, SPAM filters, a firewall, and spyware protection all for free. If you don't have any anti-virus protection on your computer cause you can't bear to pay for it, check out their site and download their free version of ANtiVir cause surfing the net without protection is bound to lead to security problems.