It seems that Windows XP reserves 20% of the available bandwidth (i.e. 20% of your Internet available speed) to itself and that is one of the reasons that you will never reach your full download speed under this operating system. In this short tutorial we will teach you how to fix this and improve your Internet speed. Please notice that this tip only works on Windows XP Professional. Also some people claim that this trick is pure myth. So I leave it here for you guys to test and see if it really increases your Internet performance or not.