What kind of computer are you talking about? Is this a desktop or a laptop?
Is this made by an OEM, like Dell, or HP, or a similar large firm, or is it a home-built system? If it is an OEM, please give us the make and model number. If it is home built, we’ll need the motherboard manufacturer and model number.
Also, which operating system are you using? You said windows, but is this a version of XP or Vista?