PC DoorGuard is a full-featured extensive and thorough intrusion scanner that scans emal messages and any media on your PC for backdoors and trojan horses.PDG easily removes any trojan with a click of a button.PDG checks every incoming email and monitors your system to prevent further infection, using weekly updated trojan database consisting of more than 7161 entries (including Nimda, Sircam, LoveLetter, SubSeven etc).Running trojan/process killing, editing the registry, monitoring ports,- all this provides a secure environment for your PC.