Keyloggers

95% of the things with keylogger,will never hack you in MS...
and if they will hack you in MS, Pin Crack was patched my son =)

Unfortunately, pin crackers aren't patched for people more experienced with programming than script kiddies. My cousin cracked his account when I was over his house a few days ago. =\ And, more complicated keyloggers take a screenshot of every mouse event you cause (i.e., clicking, scrolling, whatever). So they could tell your PIN too, if they were smart enough.

I wouldn't bother trying to find out if you have a keylogger, I would immediately scan my computer if anything suspicious like your story ever happened.