Oh, I have some rootkit scanners, and I didn't think of running those.   
I'll run that today.  Haven't used USB drives since but that's a good 
precaution.  I did of course back up the data to my external hard drive.   So I 
guess I should scan the external drive?

Karen

 
> I agree.  You probably had a rootkit.  If at all possible, I would 
> recommend you pull the drive, stick it in another system (that has fully up 
> to 
> date AV and all OS patches), and scan it.  Once a system is infected, it can 
> be very hard to clean from itself.  By putting the drive in another system, 
> you don't give the virus/trojan/rootkit a chance to hook into the OS and 
> redirect file I/O to its own ends.
>     Also, if you used any USB drives or other writable removable storage 
> on the system while it was infected, you should scan them on a known clean 
> system.  Same for any backups you made while the system was infected.

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