Is that StmWSC.exe or SymWSC.exe? The latter is definitely related to Norton AntiVirus.
If you paid for Norton, you should be able to login to the website and re-download the product. You may need to remove the existing version but you should be able to re-download from the web if you have a paid subscription. I would login and check to be sure this is the case before removing anything if you want to try and salvage it but it sounds like something has become corrupted with all the system changes recently. You could also try going to add/remove programs and see if there is a Repair option for your Norton product. I remove Norton as soon as I get a machine so I cannot say if they offer Repair or not. If they do - give it a shot before changing anything else.
My suggestion for free programs would be
Comodo Firewall and
AVG Free (which is really free and will not prompt you to pay. If you try the full version it will after the trial period.)
If you decide you want to replace Norton you will need to go to the Symantec site and run the
Norton Removal Tool as Norton is extremely difficult to fully remove from your system and that is the easiest way to do it.
Let me know how the repair/re-download looks or if you want to replace Norton. Then we can talk about your email situation.