My guess is it's a combination of the keyboards limitations and xp protecting itself from accidental user input maybe, I don't know how to find out or change what xp's doing with it, but the only changes to your keyboard that are available are under the keyboard icon in the control panel, I couldn't swear to it but if your a really good typer it may pay to get a quality keyboard that can handle your needs, but I don't have much experience in this area so see what others say first, but while your waiting check out your options with the keyboard settings in the control panel, hope this helps a bit anyway.