Situation:
After you uninstall Norton AntiVirus (NAV) and restart the computer, you are not able to connect to the Internet.

Solution:
This can happen if the uninstall process fails and leaves behind a Symantec registry value. Do the following to fix the problem:

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WARNING: We strongly recommend that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to back up the Windows registry for instructions.

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1. Click Start > Run. The Run dialog box appears.
2. Type regedit and then click OK. The Registry Editor opens.
3. Navigate to and select the following key:
   
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DHCP
   
4. Double-click the DependOnService value in the right window.
5. Delete the SYMTDI entry from the list of items.
6. Click OK.
7. Click Registry, and then click Exit.
8. Restart the computer.