I'm new to posting here, but have been lurking as a guest for a while... I'm actually having this problem in an 8 computer workgroup setting with 1 server all running Windows 2000. I am self-employed and have several companies with similar setups. The server started just out of the blue today giving this error message. The business has a POS program running on the server and it doesn't seem to interfere there, but shared printer access is no longer working. That's how the problem really cropped up. Then all of a sudden another computer started getting Norton popups about W32.spybot and it keeps popping up even though it says it's deleting the file each time. taking systems all offline before business hours tomorrow and running full virus and spyware scans. We have a firewall/router on the internet connection, so it didn't come in that way. I think a guy (disgruntled employee) may have put a virus on one of the systems and it spread to server.
But this is definitely virus activity as evidenced by the sudden nature of this change on the systems.
new addition:
Here's a link to a thread on another forum that had same problem and it was a virus named Gaobot.CHZ.Worm by Panda.
http://www.annoyances.org/exec/forum/win2000/t1107194872