Jerry has an anti virus utility called Vipre, but he still keeps getting viruses. Leo says Vipre isn't very good and recommends ESET Nod 32 for Windows. He should first take Vipre off, and then install NOD32. It's the best security software Leo knows of (Disclaimer: ESET is a sponsor). The best free AVS is Microsoft's Security Essentials.
Microsoft Security Essentials
Frank has Microsoft Security Essentials on his computer, but when he boots up, something turns off his software firewall. Leo says that's odd because Microsoft Security Essentials turns on the firewall by default when installed. The firewall can offer exceptions, and it may be that Frank allowed something to go through.
AVG free turned up trojan.dropper when Kevin ran it on his system. He also tried scanning with MalwareBytes which confirmed it, so that makes it more of a concern. He downloaded Microsoft Security Essentials and ESET and tried scanning with each of those, and didn't find anything. He only should have one antivirus installed at a time, because sometimes antivirus programs will find files in another antivirus program and flag it as a virus.