Huge COMPUTER problem need huge help
I was downloading music 2 days ago, well, I downloaded a something which is popping up things that says infected you are infected! Click here to buy this stuff. Well, I didn't click. I then, downloaded, Stop Zilla, which is an issue in itself. My computer closes down at will. And, then a small orange dot appears and nothing else so I have to restart about a zillion times, okay, 3/4 times.
Any help, any advice? I did run another program Malwarebytes anti virus and it did say it found 3 and removed them, but did nothing for this issue.
I am afraid to do any business online now, where it asks for my password except for here, lol. I won't do my banking or paying bills.