Q: I can not log on to my Imac and am having keyboard issues.

I have had my Imac since 2009.  Currently I have the El Capitan operating system installed but I still have the original

OS X disc that came with it.  I am the only one who uses it so my account is the only one on it.  I setup a log on password for security protection.  Today when I tried to log on it would not accept my password.  I tried entering it multiple times and it would not work.  I tried resetting my password via the master password technique but I could not recall what my master password is.  I then restarted and went into recovery mode.  However, when I tried to type resetpassword in the terminal box, my keyboard would not type the correct letters.  I would start typing and rese would appear on the screen but no "t" and word would always come up wiord or some other derivative.  I tried typing it multiple times looking at my keyboard to ensure I was hitting the right keys and still nothing worked.  I am not sure if this is a keyboard issue or if my Imac is infected.  I would greatly appreciate and assistance anyone could give me