You're very welcome.
Well, there is nothing to be apologetic about being a "newbie" in anything. Everyone who have become experts and specialists was once a newbie. Everyone.
It's rather commendable that being a quite senior person, you've the interest to educate & upgrade yourself in this field of computer applications.
Though I'm sorry that I can't be much of help on the matter of Outlook, since I don't use it personally.
Maybe somebody else can help you more in this particular matter.
However, here are some links you can go through to see if you find them useful:
Regarding the Outlook error you mentioned, here's the MS KB article: https://support.microsoft.com/en-us/kb/814441
About how to set default browser for Outlook you can see this article: http://www.werockyourweb.com/how-do-i-set-default-browser-outlook
And this one tells about setting the Default Mail Client in Windows: https://kb.wisc.edu/helpdesk/page.php?id=170