Hello, I really really REALLY do need help with this I keep getting this error from windows defender (I have vista by the way) and my desktop keeps disappearing, I always have to bring the windows explorer back using task manager, I use firefox and once I open it and then close it and then re-open it. it never comes back unless I reboot it. I've tried everything but this thing won't go away! Please I need help thank you so much in advance!