If you are seeing a Security Center Alert that is stating that Windows Firewall has blocked activity of harmful software (Spyware.ISpynow, win32.zafi.b, Win32.Netsky.Q, Trojan.Zlob.G, Win32.BackDoor-DNM), then you have become infected with a trojan that uses this Security Center Alert to trick you into purchasing Perfect Defender 2009 or another rogue antispyware program. Once running, this