To get more helpful info, u can search the method source:

Reset Windows 7 password| With a Password Reset disk that was created before you forgot Password

And have a try. Follow my steps:
>>1. Download Windows Password Recovery Tool 3.0

>> 2. Burn your Windows Password Recovery Tool CD.To burn your CD, you'll need a blank CD-R and the .ISO file of Password recovery

>>3. Put in your newly created CD and remove your Windows password.

Hope it can help.

Hey dear,
I would check out this article, there are some step by step instructions there on how to find out the Windows password it is asking for.
Reset Vista Password | How to Set and Reset Windows Vista Password
Have a try, good luck!