So, you logged out of Windows and need to get your password back? Thats for what this little collection is for.
Lets say you need to "crack" an Windows 2000 / XP Password. For i.e. login data. Then you should go for Ophcrack: http://ophcrack.sourceforge.net/
If you just want to login into Windows 2000 / XP / Linux etc. without using or cracking the password with admin rights, go for konboot: http://www.piotrbania.com/all/kon-boot/
And should you stumble across the problem of having forgotten your network drive passwords and login but still have access to Windows and got these pw saved, use Nir Soft Network Password Recovery: http://www.nirsoft.net/utils/network_password_recovery.html
Be advised ONLY to use these programs if they come from the orginal website as other websites do add keyloggers and other nice stuff to them. And only use these tools if you own the pc or have the rights to - check your local law!