Spyware Doctor is an antispyware program, not an antivirus program.
Antivirus and antispyware programs look for different types of malware.
Check your list of installed programs and tell about anything you see
that's from Norton, McAfee, Trend, Symantec, or PC Tools.
While you're looking at that list, also check for these three programs:
Google Toolbar, Google Desktop, and SMS Desktop. If you see any
of these three, uninstall them, since they cause problems in Windows
Mail. Web sites that let you do a Google search are not a problem.
If the outgoing mail gets to your Sent Items folder, Windows Mail
thinks it has been able to send it, and usually is correct about this.
Note that Comcast has started requiring its users to change a few
things such as the port number for their outgoing mail server, but
has not been good about telling their users about this in advance.
They don't seem to have added these changes to their setup
instructions for Windows Mail, but their instructions for Outlook
Express do have these changes and should also work under
Windows Mail if you avoid the One Click Fix. Make sure you
continue to the end of the instructions, even if you are told sooner
that your setup is complete.
http://www.comcast.com/Customers/FAQ/FaqDetails.ashx?Id=2288