Infect with Trojan.Fakeavalert, can't scan. Please help!

Okay, looks like we have Trojan.Fakeavalert. Nearly every application I try to run says something about it not being a valid Win32 application.  So, that means we can't run Spybot or Adaware.  Also, we try to have Norton 360 (version 3.5.2.10) scan the computer, but it will attempt to scan though it stays stuck on 0 files scanned.  This thing has also tried to block us from some security websites, but obviously I am here.  I have tried to turn of system backup, but also get the invalid Win32 application message.  Tried to run Norton in safe mode, but we could not get access to the program because it was not in the system tray.  We could not access it in any way that we tried.  Could someone please help us?  Just let me know what I need to do to help you help me! :)

 

I saw the program Malwarebytes mentioned a few times here so I tried to download it.  It downloaded but when I tried to run it I got the "blah blah blah not a valid Win32 application". 

Message Edited by Zeander on 08-20-2009 02:50 PM
Message Edited by Zeander on 08-20-2009 02:51 PM