password expired, but can't change it.

As soon as i woke up this morning my wife hands me her laptop and asks me to fix it. it is running Windows 7 ultimate 64 bit. When you turn it on it says "your password has expired and must be changed." First off, she has never had a password on her laptop. if you press cancel it just goes back to the same screen. So i pressed ok. it gives me the, old password/new password/confirm password, text boxes. As i mentioned she never had a password and doesn't want one, so i just left all the feilds blank, which is what i did when not wanting a password, and pressed the arrow button. it says that it's changing the password, then it says, 'Configuration information could not be read from the domain controller either because the machine is unavailable, or access has been denied.' To me it sounds like it is trying to boot off the network, but why it would sudenlly decide to do this after six months i have no idea. i thought well i'll try the homegoup password, but that returned the same message. of course, the next thing i thought about doing was doing a restore. however, even though she has a DVD drive. it doesn't pick up the windows 7 disk even though i changed it to boot the optic drive first. i found a program that is suppose to change the password, but i can't get to it, because when i try to go to comand prompt, guess what it says i need a new password.

i put windows 7 on my flash drive went into bios and had it boot from that drive first. Wouldn't do it.

Sub Styler, when i log into safe mode it still tells me that i need a new password. When i press the arrow button the message is a little different this time it says, 'An attempt was made to logon, but the network logon service was not started." Thanks for the attempt. Any other suggestions?

i went to last known good configuration. it comes up and says my password has expired and must be changed

i tried the windows debugging mode. Same thing.

i tried the Directory Services Restor mode. Same out come.

Wheter it is on safe mode or starting windows regularly it gives the same result. it sasys i need to change the password. The only diffence is that in safe mode it says, "attempt was made to logon, but the network logon service was not started." Were as, in a regular windows start up after it says i need to change the password it says, 'Configuration information could not be read from the domain controller either because the machine is unavailable, or access has been denied.' There is no 'Admistrator account." i have tried to boot from cd and from the flash drive, after changing the load order in the bios.