1. Ophcrack

The Ophcrack Windows password cracker is by far the best free Windows password recovery tool available. It's fast and easy enough for a first time Windows password cracker with a basic knowledge of Windows.

With Ophcrack, you don't need any access to Windows to be able to recover your lost passwords. Simply visit the site, download the free ISO image, burn it to a CD and boot from the CD. The Ophcrack program starts, locates the Windows user accounts, and proceeds to recover (crack) the passwords - all automatically.

2. Offline NT Password & Registry Editor
"Download Offline NT Password & Registry Editor Password Recovery"

Offline NT Password & Registry Editor works differently than most password recovery programs in that it erases your Windows password instead of recovering it. You can think of it as more of a Windows password reset tool.

Like Ophcrack, you boot to a burned CD created with the Offline NT Password & Registry Editor ISO file. After running the program, you can log in to your Windows account without entering a password at all.

If you like this "password deleting" strategy then I highly recommend this program. Offline NT Password & Registry Editor works basically the same way as PC Login Now, listed below.

I tried Offline NT Password & Registry Editor on a Windows 7 PC and it reset the password immediately without problem. It should work equally well with Windows 7, Windows Vista, Windows 2000, and Windows NT. It should also work with 64-bit versions of these operating systems.
Offline NT Password & Registry Editor Review and Free Download

3. PC Login Now
"PC Login Now Free Password Recovery Software"

PC Login Now is one of the better free Windows password recovery programs I've tested... even though it doesn't actually recover passwords.

Instead of discovering and displaying your current Windows password, PC Login Now deletes it, allowing you to access Windows without a password, after which you can create a new one.

PC Login Now works just like the free and popular Offline NT Password & Registry Editor (listed above) only it's much easier to use.

The trade-off with PC Login Now over Offline NT Password & Registry Editor is that PC Login Now causes Windows to detect a possible hard drive problem on the first reboot after deleting the password. I've never seen nor heard of a problem actually happening but it's still a little bothersome.

In a test on a Windows 7 PC, PC Login Now deleted the 15-character password to my user account instantly. PC Login Now supports Windows 7, Windows Vista, and Windows XP.
PC Login Now v2.0.1 Review & Free Download

4. Kon-Boot
"Download Kon-Boot 1.0"

Kon-Boot is yet another free password reset program, much like ONTP&RE and PC Login Now. Just burn the program to a disc, boot to it, and you're off.

Kon-Boot works differently than the two password reset tools above, so if you have problems using them, give Kon-Boot a try. It's very, very easy to use and probably the fastest password reset, and certainly password recovery, tool available.

Unfortunately, Kon-Boot 1.0 does not work with 64-bit versions of Windows.

I used Kon-Boot v1.0 to successfully delete the password on a Windows Vista PC and then also on a Windows XP PC. Kon-Boot is reported to also remove windows password but I was not able to make it work on two different Windows 7 PCs.
Kon-Boot v1.0 Review & Free Download

5. Cain & Abel
"Cain & Abel Password Cracker"

Cain & Abel is a free, fast and effective Windows password recovery tool.

Unlike Ophcrack and other popular Windows password hacking programs, Cain & Abel requires access to Windows under an administrator account. Due to this fact, Cain & Abel is a valuable resource to recover windows password to accounts other than the one you're using.

Add that to the fact that Cain & Abel is a bit more complicated to use than other password recovery apps and you have what is, in my book, a pretty advanced tool. Check it out if you think it might be useful to you.

Cain & Abel was able to recover the 10-character password to the Windows XP "Administrator" account in ten seconds. I couldn't get it to work properly Windows Vista. One user said it works great with Windows 7.
Cain & Abel v4.9.36 Review and Free Download

6. LCP
"LCP"

LCP is yet another free password recovery software tool for Windows.

Like Cain & Abel, LCP is a standard Windows program you download from LCPSoft's website and install inside of Windows, meaning you'll need access to a user account on the computer.

LCP can be a little intimidating to those new to Windows password recovery tools so some prior knowledge is very helpful to avoid even bigger problems with your PC.

I haven't been able to get LCP to work for me. If you've successfully used LCP and would like to share your experiences, please let me know.
LCP v5.04 Free Download

7. John The Ripper

John the Ripper is a very popular free password recovery tool that can be used to find Windows account passwords.

While the password recovery application itself is free, the wordlists used by John the Ripper to discover passwords do cost and are required for the software to work.

Note: I'm told there are free wordlist alternatives that work with John the Ripper which is why this Windows password recovery tool is still listed as free. However, I have not tested any of them.

John the Ripper is operated at the command line making it a password cracking tool reserved for the very advanced user.

If you have experience with John the Ripper that you would like to share, please let me know.
John The Ripper Free Download
Windows Password Recovery Tools Aren't Necessary if You're Proactive!

These Windows password recovery tools are great if you need them, but there's a much easier way to access your account if you forgot windows password - a password reset disk!

How To Create a Password Reset Disk

I suggest you try to use Anmosoft windows password reset tool to create a password reset disk. Before you create a reset disk, you should prepare a bootable CD/DVD or USB flash drive.  When you have done, insert the burned CD/DVD or USB to the locked PC to reset windows password, and then restart your PC to logon.