|If you can boot to some linux dvd, I;d try it first and get your data off to some external disk. It may be that you don't have a user anymore to get data off. See what happens with a live cd/usb/.|
I would not think your wife borked it just yet.
She may be part of the deal but there seems to be other things going on.
One is if you want to try to repair it. Almost any Vista DVD and maybe some repairs can be done with the Windows 7 DVD.
Since you have played with the password reset it may or may not have helped your situation. You can't simply try that stuff and guess it to work. It could be that is the cause of this. Microsoft makes a way to create a password reset disk. Next time make one and use it.
You have to get the dvd to boot. It may be that your usb keyboard is the fault. Try a ps/2 keyboard.
Why did it take me over a year to phone in a problem to ATT?