Martin got a popup saying he's been infected and he needs to buy a Moneypack card and send it to the FBI. Leo says that's a ransom ware scam. Bad guys rely on users to run software through social engineering. AntiVirus will protect him from everything but himself. If he chooses to install something bad, even if he isn't aware it's bad, he's defeated the AVS protection, and that's what they rely on. The only way to get rid of it is to backup his data, format his hard drive, and reinstall Windows from a known, good source.