Windows has nothing to do with the BIOS, BIOS is what loads Windows.
To reset your BIOS you want to remove your CMOS battery from the motherboard of your computer
BIOS is NOT what loads "Windows"
BIOS (basic input/output system) is the program a personal computer's microprocessor uses to get the computer system started after you turn it on. It also manages data flow between the computer's operating system and attached devices such as the hard disk, video adapter, keyboard, mouse and printer.
After BIOS, BIOS runs POST
A power-on self-test (POST) is a process performed by firmware or software routines immediately after a computer or other digital electronic device is powered on.
If the computer passes POST, it will then boot up the system from whatever media you have set in BIOS.
So go shoot yourself in the foot thinking BIOS is what loads Windows
Furthermore directing at OP
There are several ways to bypass a BIOS password, the easiest being to remove it all together, this would either be removing the CMOS battery, or clearing CMOS via a jumper on the motherboard.
Complementary metal-oxide semiconductor, or CMOS, typically refers to a battery-powered memory chip in your computer that stores startup information. Your computer's basic input/output system (BIOS) uses this information when starting your computer.
If you clear CMOS, it removes the password.
Other than that you can check if their is a backdoor password that depending on the age and manufacturer of the motherboard may have included.
Other than that, there is also the possibility of Socially Engineering the owner that set the BIOS password