Trouble logging onto my old desktop with windows xp pro

Hello,

I'm having trouble logging onto my desktop. I haven't used this computer in years and I can't remember the password or anything and I do not have the cd that came with it. I've tried a few different things to try to get past the log in screen and to reset the password. Safe code with command prompt is of no use and neither is selecting safe mode. Is there any other way to get past the log in screen or to change the password? I do not have it connected to the internet, so I'm using my lab top to change to figure out how to do this.