How to Reset or Remove Windows 7 password without any third party software
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1.Insert a Windows 7 DVD and boot with the DvD

2.Select Repair option.

3.It show a list of Tools to Repair your PC.Select Command prompt from the list

4.Type "copy C:\windows\system32\sethc.exe c:\ -------it means take a backup of sethc.exe file in c drive

5.Type "Copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe----replace the file with cmd prompt

6.Type "yes" it ask to overwrite

7.Restart your PC.

8.After the logon window will appear Press SHIFT KEY 5 times

9. Now command promt will open.

10.Type "lusrmgr.msc"

11.Select users and select which user.Right click on the particular user and reset the password

12.Try to logon with New password.