I've been set my BIOS settings and I also set a Password for my security but after a while I typed my password because the settings was not working properly and then the password I typed was Incorrect, I Repeat typing my password maybe I typed it wrong but it really didn't work. Please help me I cant go to start up Windows, someone changed my BIOS settings and changed the password.

 Piece of cake, Gerry!!

Grab yourself a philips screwdriver (or whatever you need).... to open up the left side of your computer case.  Turn the system off, and either unplug the power supply cord, OR just turn off the power supply switch located just near the cord's input socket.

WARNING:  Touch, and keep in touch at all times when touching parts on the motherboard, the metal siding of the case to remain grounded.  Any static discharge whether you feel it or not, can damage your system! 

Now... look for a battery on the motherboard, typically it will be a 2032, and just a bit bigger than a nickel... ya can't miss it.  There'll be a small tab on the side of the battery clip.  Use a toothpick, or the edge of your fingernail to press in the tab GENTLY!!, and the side of the battery will pop loose.

Leave the battery out for about 30 seconds to one minute.  Replace the battery.. plug back in the power supply (or turn the power supply switch back on).  Some motherboards require you to not only remove the battery, but also use the CMOS RESET jumpers usually located near the battery.  Please verify this by using the motherboard's manual.

This will completely reset your BIOS settings.  So if you'll have to reset all your options that you used before. 

 If you use an AGP/PCI-E video card, the BIOS will most likely be reset to the PCI slots... if you use a sound card and not onboard sound, the reset will turn back on the onboard sound..., so on and so forth.
 

A jumper, is a set of pins on the motherboard that have a small plastic connector.  That connector is used on those pins to "make a decision" if you will, about how something is done on the board.  Your motherboard manual will tell you IF you need to use those jumpers in conjunction with removing the battery, to reset the CMOS information...(aka BIOS).

Take note however, that the Clear CMOS set of jumpers, may or may not be located right next to the battery... if they are there at all.  If they are not on your motherboard, then just removing the battery for about a minute, will reset the CMOS information. 

Back in the old old days of motherboard manufacturing, jumpers were used to make almost all the decisions about the hardware.  There were jumpers all over the boards, determining:

1.  what processor was being used, how fast it was
2.  what speed the memory was
3.  what kind of video card
4.  system clock speed

etc, etc.... 

But nowadays, that's all been replaced by the CMOS chip containing the BIOS information.  It's in there that you make your decisions on overclocking, drive boot sequences, power settings.... security, etc.

If you do not have a manual for your board, you'll have to know the model, then you can either Google it, or post it back here.. and we'll help you look for it.