If you truly did the nx generator, possible chances you were probably only phished. Which changing your password will do the trick, as long as you didn't download anything anyway. But it having continuous suspicious activity on your account even after a pw change, then you getting keylogged is another possibility.
As another user mentioned, look at your processes and if you see anything suspicious, you get the picture. Keyloggers can also hide under other similar processes which you might mistaken for a program you know such internet explorer or firefox. I'd do a fresh install honestly.