[J4W3S]

Learned this nifty trick when i locked myself out of my account.
You will need a Linux live cd (also works if Linux is already installed).
once you have loaded your Linux cd.
1. go into the windows partition directory.
2. find system32 and change the file name sethc.exe to sethc1.exe
3. next find cmd.exe and change it's name to sethc.exe
4. save your changes and restart your computer

Now when the login screen appears, press shift 5 times and a terminal will open.
With a terminal open you can now change the password to your account.

Code:

net user (username) (new password)

You can also give other accounts admin privileges using.

Code:

net user /add (username) (password) <-- skip this step if you already have an account made
net localgroup administrators (username) /add
net share concfg*C:\/grant:(username),full

[3r3bus]

I've used this trick numerous times. You could use Kon-Boot which would be much quicker. I've got a old tutorial up regarding its use: http://www.hackcommunity.com/Thread-Hack...-Account-s

[Psycho_Coder]

Well, I used this but didnt worked for me.Also does it work on windows 7

[ProTech]

This have been around for a while, and I'm pretty sure we all know about it.
Maybe you should tell us something new?

[LiXon]

Good trick, thanks for share.

[J4W3S]

Well, I used this but didnt worked for me.Also does it work on windows 7

if it isn't working for you try the same thing except don't change sethc.exe change utilman.exe. this is the easy access center in the bottom left of the login screen for windows 7.

[3r3bus]

Well, I used this but didnt worked for me.Also does it work on windows 7

I've used this method a few times and it works.

If you're looking to bypass Win7 user password, you may want to check my Kon-Boot tutorial out.