You wont get a drive icon called "windows" on the desktop, what you will see is the actual drive,
in your case you are shown /dev/sda1 and /dev/sdb1

This means that you have two SATA drives sda1 and sdb1 or possibly another memory stick.

Click on the drives, they will open and display contents, you will be able to see the contents of the drive and find your windows drive.


To be certain from a terminal post the output of

fdisk -l

(last character l as in "long")

SAM files in windows are in /WINDOWS/system32/config//SAM for XP
or /Windows/system32/config/SAM for Vista, there is a spelling change in Vista.
If you want to change passwords install chntpw