Hi
I'd look online for your specific computer and see if you can find info on removing the battery.
Look up info about your motherboard and see if you can find something that says that, that will work.
I only know that I've always been told that that will work.
Here I found this, with pictures...
http://www.technibble.com/how-to-bypass-or-remove-a-bios-password/ If you have a local computer shop you might want to just take it in and let them do it, it should only take a few minutes.
You didn't say if this is a laptop or desktop, a desktop would be pretty easy to get into.
The way that you installed Windows may be the problem with you install, I've never heard of doing it that way but I don't know everything.
You can make an install disk if you can get the computer to boot to it.
Just download the correct ISO and use Imgburn to make a bootable install disk from it.
Mike