Can the bios be upgraded

When updating your motherboards biOS, you need to firstly find and download your motherboards biOS update. Check the manufactures site of your motherboard.

Once you find your biOS update, its important that it is for your own model motherboard, then they usually include a text document with the instructions on how to install.

It is usually done by a Floppy Disc and is known as "Flashing".

So first find out what make and model your motherboard is, then search for the latest biOS update for that particular board, download it, read the instructions that come with the download. Or search "How to update your biOS". Instructions are often given with download though.