I think I have a keylogger?

I remember downloading a file right before vacation (that just ended yesterday) that would not open. I run on a mac, so I wasn't too worried. The file was.exe, and I used winebottler to run it. Anyways, the next day I get onto my computer and try to get on minecraft. I couldn't log onto my account - somebody had gotten onto it and changed the password.

Now I was very worried. I was 50% sure I had a keylogger, and I had no clue about how to get rid of it.

The night before I flew off to Orlando, I reset my computer to factory settings and put the files (none of them were the.exe I downloaded, so I didn't back the.exe up) I needed on a flash drive. Now I felt sort of safe, but I felt like there was a keylogger on my computer still.

My birthday is Wednesday, and credit card information could be entered on my computer to buy something. If there's a keylogger on my computer, the money could be stolen and bad, bad things would happen. Of course if this happened I would take him to court and sue him.

Please, please please please help me out here. I need to get rid of this keylogger.

Make sure if your mac has a good antivirus.
If you don't, call your bank's hotline.
buy a new hard drive and ask apple store to install fresh Mac OS
never use your old drive
make sure you have a good antivirus again

Yes, there might the chance you had a keylogger It can record your general stuff but can't record pass. To record the password they need the admin user authentication.