It turns out that it was some kind of a virus...
So I can use the key***rd just before Windows XP starts,
but I can't use it after.
So I went into Safe Mode.
Now there wasn't a guest ID,
but only my Admin ID (Peace Force),
and a strange Administrator ID.
I'm guessing the password for the Administrator ID is something like admin.
I know my Admin ID password.
The problem is...
I still can't type even though I'm in safe mode.
Someone pro must have hacked my computer.
Is there any other way to try to log in?