I can't log on on my computer anymore!

rono

I have a computer which is running XP Pro and the users(2) had no passwords before.I set up password for both users and I have changed the network ID of the computer!which prompted me to reboot my computer.After reboot I couldn't log on with the new password.I tried to log as Administrator but the same error:invalid password!
I'm typing the correct passwords but none of them works!?
I remember that I had 2 partitions on my HD (C:,D:)and I've installed another XP Pro on the other partition ,where I'm writting from now.
So,please help!Is any chance to fix the logging problem on my C: partition?I did not created any password recovery floppy disk and I think the problem is because I've changed the ID network of the computer,which usually is done when the computer is in a domain.My computer is not part of an domain,is a stand alone.
So,any help?I have the WXPRK 2.nd edition but I'm not finding anything which can help me.

I'm waiting

kampungboy

Download the trinity rescue package and you can reset the administrator password. There is good enough instructions for you to follow.you can find it here http://trinityhome.org/trk/ but whoever use this software, please don't abuse it!!

rono

I'm downloading the software and I'll try to figure out the ways I can reset my password.Thank you for your reply....and I'll keep this advice just for personal emergency purposes;)

Have a nice week end!