Like what you machine is or what OS you are using. Did you run the Norton Removal tool? See here:
Norton leaves a scattering of stuff on your system if you do not run the tool, which may be causing your trouble.
I purchased AVG internet security. it downloaded w/ errors. removed my norton like asked, now i can't connect to my internet service. I paid $90 + for AVG, I don't have that, I don't have norton and now I don't have my internet service. can't get AVG tech support to return my e-mails and for "LIVE" support, it will cost me $20 per 15 minutes. What a rip off. their crap screws up my system and I have to pay for service I've never used? calling one of their resellers, gave me something to try but if that doesn't work, wants me to bring it in for $25 to look at it. I'm sick!