Prevx is a free anti-virus software that you can use to check if your system is infected by malicious software like rootkits, trojans, viruses, worms, bots, spyware and adware. This program is highly preferred by common users due to its excellent features, its ultra-fast scans and the benefit that it does not slow down system performance. Its interface is simple yet professional with small number of commands and a single click scan facility. It provides you with pop-ups during scan to let you know what is going on. This software seems to be the best one that you would like to use to clean up your computer of harmful viruses.