Windows 7: Cannot Remember Administrator Password Windows 7

Here's my situation: Over 6 months ago, I got my hard drive on my laptop replaced. My girlfriend decided to make a user account on my computer. She claims that while making it, the computer didn't let her set a user password. And, she didn't make a recovery disk with the password on it, because she says there was no password!

So, when I try to download any program (iTunes, for instance) this window comes up:





Of course, as you can see in the picture, I cannot click anything but "No."

I am not sure what to do. I am not good with computers at all. Any help would be appreciated! I've had an iPhone 4 for 4 months and not been able to put any music on it!!!

I don't know for sure if this program will help you, but you can download SIW and see if it shows the password.

SIW - Download

I use it from time to time and have noticed that there is a password option on it, but it could just be for websites that you have in your browser. I don't keep any that way, so nothing shows up for me.

Just a guess.

Have a look at this tutorial and the related tutorials in the bottom.