Well, my computer has a Windows password. And I don't need to use it to install a new OS. A new OS can be installed from start-up before Windows has even been started.
The link I posted was for ways to remove the BIOS password. Not the Windows password. But you don't need to enter Windows to install a new OS and format the hard drive.
All you need to do is change the boot-order of the computer in BIOS. Instead of booting from the hard drive where your OS is located, you simply change the settings in BIOS to boot the computer from the CD-ROM instead of the hard drive. Put the Windows DVD in the DVD-ROM drive. Then restart the computer and follow the on-screen installation instructions when your prompted to install the new OS. All of this occurs without needing to enter Windows or use your Windows password -- before you get to the "Windows is Now Starting" screen.
If a computer's BIOS has not been protected with a password, it is possible to do this using the simple steps described above. However, if the BIOS has been protected with a password, a thief would be required to circumvent the BIOS password using the methods described in the link I posted previously.
This I've done this change boot-order procedure many times on my own computer when I need to reinstall the OS when it's time for a fresh install of Windoze -- and it's really not much of a secret -- so I have learned quite a lot, actually. Just sayin'.
Are you saying that it's possible to setup a password, within Windows, that checks for a password upon BIOS startup -- before you enter a password at the Windows start screen? Because I'd like to know that trick, it would be helpful to know. Normally that is the job of the BIOS password -- to prevent someone from being able to enter the BIOS or reach the Windows start-up screen.
Laptops (as opposed to desktop PCs), especially these days, are much more secure and the techniques listed in that link might not work. Laptops that are more than 4-5 years old, however, can generally be circumvented using the techniques outlined in that post.
Here's a link on that, which also says that a BIOS password is generally the best way to protect one's laptop:
One cannot stop a thief from stealing your computer but you can stop them form getting your personal information out of the computer. What I recommended in my previous post was to password protect the BIOS and the windows system both. You are correct about removing the battery to remove the password in the BIOS on some computers, but with the newer ones that technique doesn't work anymore. With the newer computers you would have to change the BIOS chip to make the computer operational again which most thieves wouldn't know how to do. There are programs to break a windows password but I haven't seen anything to break a BIOS password. I can break a windows password no matter how large or what combination of number and letters you use in less than 5 minutes. So a windows password will only stop a thief that isn't very computer literate