I am running Windows XP. I do not have Windows Defender, whatever that could be. But I do have Spybot - Search & Destroy that watches registry entries. Could this be messing with things?

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8