Are you running Norton Internet Security or Norton Personal Firewall 2002? If so, run LiveUpdate and make sure you have the updates for the software, not just virus definitions. symproxysvc. exe is a valid file for NIS/NPF. You may have to create a new rule (allow access) after the update because the LiveUpdate modifies the file.
Jeff C.
If all else fails, read the directions.
If that fails, REBOOT!