1. Malwarebytes (because almost all infections now days are rogue software and no other security product can detect and remove as many as MBAM)
2. Avast Free (because it is the only free AV that is not limited in features or protection, is very user friendly and light on resources )
3. Emsisoft Emergency Kit (because it is the best advanced malware removal tool)
4. Ultra Virus Killer (another excellent removal tool, can remove what Hitman Pro finds for free)
5. ZoneAlarm Free (one of the last of its kind to be a true stand-alone firewall without advanced HIPS features and unnecessary bloat, very user friendly, offers excellent network control and cloud technology from Kaspersky Labs)
Thanks.