Resetting windows passwords
I had to reset the password of an account on a system running windows 7. There is a wonderfull linux live CD to do the job really easy.
Go to http://www.sysresccd.org/Download and download the according ISO image. Burn it and boot your windows machine.
After sysresccd has booted mount your windows partition:
ntfs-3g /dev/sda1 /mnt/windows
In there you should find a file named SAM.
List users by running:
chntpw -l SAM
chntpw -u SAM
Chose 1 to clear the users password.
Write this changes to disk by pressing Y.
Taddaaa. Reboot. Easy as can be.
I presume that you do have some basic linux know-how. e.g. how to find partition types. If you do have problems doing this leave a comment.