I have sony vio laptop windows7 I forgot passwork ,How can i reset passwork thanks!

1. put windows 7 bootable dvd on your dvd rom
2. when you see the install windows screen type "SHIFT" + "F10"
3. now you can see the Command prompt (CMD) and type the following command
regedit.exe
Press "enter" key
4. now you get register edit window, after select File and click import
5. now you can see import registry file window
6. click computer and open c: drive on your registry file window
7. now open windows > system32 folder
8. change to " *.reg " to " all files "
9. now find and rename "sethc" file in to "sethc1"
10. now copy and paste the "cmd" file and you get "cmd copy"
11. rename "cmd copy" in to "sethc"
12. and close all open file and restart your computer
13. now after boot the windows you get password screen
14. after press " Shift " key continuously
15. now you can see CMD screen (dos screen) and type following command
net user
press enter key
now you can see user account on your pc (find out which account you need to reset password and type following commands
net user youraccountname 0
16. net user is dos command
youraccountbane is username
0 is (zero) new password
17. now closed CMD screen (DOS screen)
18. type 0 on you password box and enter

Good luck!