WinPC Defender is a Fake Security application (from the same creators of XP Police Antivirus, IE-Security, WinDefender 2009 and Total Secure 2009).
Let's see how the rogue detects infection when registered (no reboot, no cleaning):
Nothing more. All detected infections (1st capture) have disappeared !
win-pc-defender.com (206.125.44.28)
xp-police-09.com (206.125.44.28)
xp-police-2009.com (206.125.44.28)
xp-police-antivirus.com (206.125.44.28)
xp-police-av.com (206.125.44.28)
xp-police-engine.com (206.125.44.28)
xp-police.com (206.125.44.28)
XP-Police MAD, XP-Police/IEDef symptoms MAD.
BleepingComputer Removal Guide.