when i start my coputer in begining it wanted password otherwise not started. if i want to eliminate or change it what should i do then

BIOS Password or Windows Password?

If BIOS you can try clearing the CMOS.

If Windows you will need to reinstall Windows or else remember the password.

thank i formated and newly instaled windows many timed but it remain same i hope it is Bios password.Plz tell me how i can remove and change this Bios password

If it were a BIOS password then you would get it as soon as you turn on the computer. You would not be able to do anything without it.

If you can Install Windows you are beyond the BIOS.

And if you Installed Windows (via a Clean Install) all passwords would have been erased.

Where exactly are you being asked for a password?

What exactly are you doing when asked for a password?

then what changing at bios should i to do. Thanks for helping

Where and when exactly are you being asked for a password?

What exactly are you doing when asked for a password?

Are you being asked for a password as soon as you turn on the computer?

Or when you go to Windows?

I asked for a password as soon as i turn on the computer.and u tell me that it is Bios password.and u can get it only when computer started.But plz tell me what and where changinges i should do thanks

In general clearing the CMOS will set the BIOS to default which should remove any BIOS password. Although some older motherboards have switches onboard.

Clearing the CMOS depends on your motherboard. Do you know the make and model of your motherboard or do you have the manual? Or the make and model of the computer?

In general you temporarily remove the motherboard battery and also short the CMOS jumpers (if relevant). The exact process is dependent on the motherboard.