thanks Swapnil, Brian81 and pete for the information. I believe this is a good fix. I had previously upgraded one of these machines to sep12. This stopped the autoprotect notifications immediately. However, shortly after installing sep 12, I ran microsoft safety scanner, and it was still finding a threat in the path noted above. Today, I looked at this workstation and the path was no longer there at all (I had never deleted it). I ran mss again and it found no infections. So it looks like the upgrade has resolved this issue.
Do you know if upgrading to sep12 deletes this folder path? c:\programdata\symantec\SRTSP\Quarantine
Incidentally, we use MSS because sep11 (which is our current corporate standard) does not catch all threats. Do you know if SEP12 does a better job?
Thanks again for your prompt responses!!!