Yep. Google is your best friend. Remember that. Get used to seeing the processes in the task manager, and try to remember them so when something funky shows up, you already know what to look for.
Laying off the IT guy is a BAD idea. Change all passwords now. And by now, I mean yesterday. Find out of there are open ports on the router, or if there are open VPN accounts he has access to. Lock it down with your own passwords. Change local/domain admin passwords. Give one copy to the owner of the business and keep the other in your head. On the other hand you can put them in a hidden fire proof safe and keep them in your head. If you can just keep them in your head, that is best, of course
NEVER!!! update drivers from windows update. Get them from the manufacturer's website. You have been warned.