Affiliate Marketing Secrets

A Windows Microsoft company gave me a call and suggested to help me remove malicious files on my PC. I was vigilant at first but as they claimed to be affiliated with Microsoft i of couse said why not, I can always hang up if something’s fishy.
I’d never gotten a call from Microsoft, at least not that i’m aware of but i don’t know, anyway. The directed me to www.windowspcsecurity.com (safe?) and had me Connect to Tech Support; I wasn’t too sure what it meant but it gave them access to my computer and with that they explained the sources to certain problems on my PC and such.
Come the end they referred me to their website onestopplus which i KNOW has a bad reputation, i had No idea this was their intention and after seeing the prices i passed.
I shut down my computer and now i’m wondering if thats enough to revoke their access to my computer?

I am being asked by a potential employer to complete a credit report from there. This seems kind of fishy as I found the job on craigslist… lol