Here we go,
1) Login with a guest or normal user (no need to be admin user)
2) Go to C:\Windows\System32\
3) Cut the file sethc.exe and paste in some other location (D:\)
4) Copy the cmd.exe and paste in some other location(C:\)
5) Now rename the cmd.exe (in C:\) as sethc.exe
6) Paste the renamed file in C:\Windows\System32\
7) Now log off.
8) During the login Screen press shift key five times.
9) Now you will have command prompt in your screen.
10) Now type net user administrator *
11) It will ask for new password.
12) Type your new password.
13) Now it will ask to retype password. Type again.
14) Thats all. Done..(yippee!!!)
* Here 'administrator' is the administrator login Name
