BIOS password we are using to add some extra security to our computer, You can either set a password to prevent access to BIOS settings or to prevent PC from booting.
But sometimes this extra security might become a pain when you forget the BIOS password or someone changes your system BIOS password intentionally.

The simplest way to remove a BIOS password is to simply remove the CMOS battery. Almost all motherboard use this CMOS bettery to save all BIOS setting, A computer will remember its settings and keep the time even when it is turned off and unplugged , If we pull out this battery, the computer will forget alot of its hardware settings, and it also forgot the old BIOS paasword and then you can easily run your computer.
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Good info for resetting the BIOS password, But the Windows password remains unaffected!
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We can easily crack password of Windows using a software called Ophcrack.. I have posted about it on my blog, if you want, then you can read it here- http://bit.ly/dtkOKu
thanks for the link buddy