one of my friend entered into my windows xp , administrator account using 2 letters what could that be please?

Question

is it possible to login to a pc with out knowing the password of the administrator if yes what could that be

Answer 1

You might be confusing your admin account with your personal account when you log into the computer normally.
Logging into Safemode is only a matter of a few key strokes immediately after reboot.

If you log into Safemode. You can Log into the admin account. (( assuming that no password was entered in for the admin account ))

I'm sorry I can't help you beyond that.