I used the RNIS and RNAV removal tools. But when I checked the registry as one Forum user suggested, Symantec was still listed in one of the places. ControlSet001/Control/VirtualDeviceDrivers shows VDD REG-MULTI-SZ C:\PROG~1\SYMANTEC\S32EVNT1.DLL
Since I don't really know what I'm doing well enough to mess with the registry, I'm not sure what to do. If I could just uninstall Avast and then reinstall, I would like to give Avast another try. But if Avast and any leftovers from Norton are going to clash, (as stated so in many forums) then I guess I will just have to try Grisoft AVG or something else. Oh well, it's too bad for all of us thousands and thousands who have had Norton on our systems at one time. Maybe I will try it one more time.