Ez- as you have figured out, you are very vulnerable.
Microsoft does not call ANYONE. Standard opening for a scammer-"I'm with Microsoft. We have found there is a very dangerous virus in your computer."
Lifelock is not a bad move. If you are an NRA member, you can get 60 days free, and $9 a month for their basic service.
In addition, if you are NOT a computer geek, find one where you live. Make arrangements to take computer to them, have them sanitize it.
AFTER you do that, change your passwords to any website you visit- including this one.
Then go back and put a sticky note on the computer- "Never
give information to anyone that YOU did not call."
Now, not to scare you- but how vulnerable are you? Worst case- you did your taxes on the computer? Well, there is your personal info, including SSAN. Pay bills on line? Do banking on line? Buy anything with a credit card on line (like Amazon, E-Bay, etc)? Then your banking data and credit card data are at risk.
Myself, I follow another means of Risk Avoidance. I am so broke that identity thieves send ME money. But that does not work for everyone.
As far as unusual names being a traceable link to information, screen names can be a similar route-especially if you use the same name on several sites. If Joeblow72 chose that screen name because his email is email@example.com
, it can be much easier to creep into his information.
BTW, I am NOT a computer geek. I'm just a paranoid guy that understands how many scammers there are out there.