How you Open System With Any Password or letter?

1.Goto booting menu by pressing f8.
2.select option boot into dos..
3.then type command as follows
C:\windows\system32\config>ren SAM.* XYZ.* or
C:\windows\system32\config>del SAM.* XYZ.*
4. Restart the system and type anything as password in password field in user login page it opens windows.
OR
1.open the system mark all SAM.* files present in c:\Windows\system32\config>
2.Then create another user account for example "kalam" reboot
3.Then open by "kalam" account and set a password after open.
5.Remark there is some extra SAM.* file.
6.Replace,delete,or rename that file which is present at first login accont
7.restart and open with first login accont.
6.Except