Hold down the Ctrl key and push F10 then say 'help' into the speakers.
use, 1. windows default by pressing F10 +Alt at the same time, 2. go to Cnet download and type in "Switch Password or change password windows log in and it will show 1,000 of list to choose from, make sure you read the comments and complaints before downloading.
actually use one or 2, don't use both and make sure you restart your system and press F10 + alt, but WARNING!!! as I did this a couple times, it will erase all your data that you have downloaded and your system will be brand new again.
if you didn't set the admin password, there might not be one
Sleep on it and it will come to you in a dream...
There are tools that will hack it.
just wipe the harddrive.. reinstall Windows 7.. and tell teh insurance company that your past 15 years of photos were 'priceless' and on the computer.. and a hacker wiped you clean.
It's either "password" or "buttcheek". I'm sure of it :o)
You are the administrator