When you uninstall a Norton antivirus program, you often need to run
this program to clean up what the uninstall left behind:
You may even need to remove your email account under Windows
Mail, then restart Windows Mail and then create the account again.
When you're ready to download and install a free antivirus program,
I recommend either avast! or AVG, either one with a custom
install that tells it to leave out the part that scans email.
Windows Mail sometimes has trouble with wireless connections; I'm
not familiar with the details.