If you need to reset the password to Windows 7 on your computer, likely because you've forgotten it, let me first assure you that not only is this very possible, it's not even that difficult.
Unfortunately, aside from a password reset disk (discussed in Step 1 below) there is no Windows-provided way to reset a Windows 7 password.
Luckily however, there are cleverly designed and freely available Windows 7 password reset tools that you can download from another computer and then use to reset the password to Windows 7 on your computer.
Note: If you want to reset the password for Windows 7 but you can still access Windows with your current password, you don't need to follow these instructions at all. See How To Change Your Windows 7 Password (from within Windows) if you need help.
Follow these easy steps to reset your Windows 7 password:
Reset your Windows 7 password with your password reset disk.
I'll be honest, I put this step here knowing that you probably don't have a password reset disk. However, once you get yourself back in to Windows using the remaining steps, please create one as soon as possible. You can see more about this in Step 8 below once you're done.
Download one of the following Windows password reset tools:
Either program will reset your Windows 7 password but ONTP&RE (Offline NT Password & Registry Editor) is my favorite. It's a bit more difficult to use but tends to be more reliable and avoids a data corruption possibility that exists with PC Login Now.
Important: I highly recommend that you read my review and step through the walkthrough for the Windows 7 password reset tool you choose. You can skip the rest of the general instructions on this page if you use my tutorials.
Burn the ISO file you downloaded to a disc. Make sure your burn the image properly and don't just burn the file itself to the disc or the Windows 7 password reset program you chose will not work correctly.
Boot from the disc you created and let the password reset program start.
Reset your Windows 7 password using the instructions provided on screen.
Important: Again, I recommend that you step through the tutorials for these two Windows 7 password reset tools that I linked to in Step 2 above, especially if you're using Offline NT Password & Registry Editor. There are several confusing steps that screenshots do a great job at clearing up.
Once the Windows 7 password reset is confirmed, remove the disc from the drive and restart your computer.
With your Windows 7 password reset, you can now login to Windows without a password at all. In other words, leave your Windows 7 password blank if asked for one.
Did Your Windows 7 Password Reset Attempt Fail?: Try the other program from Step 2 and see Tip #1 at the bottom of the page for help. There are several reasons why you might not have been successful and also some other options to consider aside from using one of these password reset programs.
Create a new Windows 7 password. Now that you can get back in to Windows 7, configure a new password right away.
Having a secure password is very important so please don't keep using Windows 7 without setting one up. Just make sure it's a password you'll remember this time!
Create a Windows 7 password reset disk. A password reset disk is special floppy disk or flash drive that you create in Windows 7 that can be used to easily reset your password if you ever forget it again in the future.
As long as you can keep this drive or disk in a safe place, you'll never have to worry about forgetting your password, or using one of these password reset tools, again.
The Windows 7 password reset tools I linked to in Step 2 don't always do the job. If they didn't for you, you could try an actual password recovery program like Ophcrack but honestly, Offline NT Password & Registry Editor and PC Login Now both tend to work better for Windows 7 passwords than Ophcrack.
You might also want to check out my Windows Password Recovery Programs FAQ page for more discussion about all of these programs.
Finally, you should also know that a password reset or recovery tool isn't the only way to get back in to Windows 7 if you've forgotten the password. See Help! I Forgot My Windows 7 Password! for a full list of your options.