First of all, this may be caused by an infection, if Norton actually caught it, it may also be blocking the internet due to an infection.
Are you sure Norton Firewall isn't set to block? Check the settings if you may have accidentally changed them.
<<I have seen several suggestions of downloading fixes but if I can't get online where does that help? >>
but you also stated:
<<I have 3 laptops in the house (all using a wireless connection to the internet) and they all log on to the internet without any problems>>
Ok, you can access the internet then. What you need to do is take a working laptop, download Malwarebytes Antimalware...
transfer the file to a USB stick or CD\DVD media, put it on the PC in question and run it. It will take a while depending but our first task is to see if there are any malicious items running.
If none detected by MBAM or Norton....
Then this error is typically related to Norton. I personally have removed Norton on a few systems in the last couple of months due to this. No fixes, well, fixed it, except the removal of Norton itself.
Did you purchase Norton? Did it come preinstalled? I ask because you may need to reinstall it and will need the setup file or disk, or if OEM system, the recovery disk to reinstall Norton.
Please read here...
Do the same as instructed with MBAM above, download the removal tool onto one of the 3 laptops, put it on a USB or CD or DVD, some media it will fit on, then put it onto the PC having the issue. You can even read the "How To" from the other laptop as you do this.
Once removed, you should be able to access the internet again. Reinstall Norton, do updates, and you should be good to go. If you find later on you don't want Norton, there are numerous FREE and PAID for alternatives.
Hope this helps
I have a desktop (OS Windows XP) which is where my internet is connected with the Actiontec DSL Modem/Router - connected by an Ethernet cable. I cannot log onto the internet with this computer - I get Error 12029. I have 3 laptops in the house (all using a wireless connection to the internet) and they all log on to the internet without any problems (2 have OS Windows XP and 1 has Windows Vista). I have checked the LAN settings as that has been what I've seen as the solution for the error. My settings are what has been recommended. The other thought was about antivirus software - I have Norton on all 4 computers. I have seen several suggestions of downloading fixes but if I can't get online where does that help? I am getting frustrated. Can anyone help me?