Hey Men got a solution, this works.

for sure!!!!!!!!
Get the Active@Boot Disk, it is an ISO file. (Google it).
It consist of two ISO types--> GUI and Dos
GUI is 128MB
Dos is 9MB
Both the types have the same function and same procedure only the interface is different. What it does is that it removes the password and the next time u boot u are able to enter the OS without any login or password.
Download any of the ISO and burn it as bootable file in a CDROM.
Next boot the PC from the CDROM. and follow the steps.
(I am explaining the DOS mode, it is much better) GUI is same.
1. First screen u will get is
Choose option 1 (Logical drive)
2. Second Screen
Choose the drive where your OS is installed.
3. Choose the Local users from the list
NB: Here u r choose the user, whose login password u have forgot and not the administrator. Suppose if the user name was "Andrew" then select the no. assigned to the name, but if u want u can clear the admin password also.
4. User account information
Here by default two option are selected
Password never expires
Clear this user's password
So just press Y button
5. Password Resetted
Password is resetted
Take the CD out and press ESC repeatedly untill u reach the null screen. Restart the machine. u r done the password will be cleared.
Have checked it in Windows Vista Ultimate, it worked and it will work for other OS also. :hap2: