The BIOS is a bit of software that sits on your computers motherboard and controls how each component talks to each other. It is a good idea to upgrade this if possible to the latest version as you could see many benefits. A BIOS upgrade will help the motherboard to be more efficient in the way that its components talk to each other.

To upgrade your BIOS find out what motherboard you have (You can do this by looking in the manual that came with your computer, or you can look at the screen that first shows when you turn on your computer, it should like the make and model on there) Then when you know what motherboard you have go to the manufactures web site and search for the latest update. 

 Be aware that BIOS updates could possibly harm your system if not installed correctly, Computing-Tips.com can not be held responsible should you cause harm to your computer.Next go in to your BIOS (Do this after you have upgraded BIOS as setting might go back to default settings if you upgraded) Make sure that all cache settings are enabled especially on the CPU.  Disable any devices you don’t use, for example if you dont use USB disable it.  Devices will use up valuable memory when your system has booted in to windows xp.