Internet is slow?
If you have a windowsXP machine that means it will be moderatly new, not ancient. It should have no problem dealing with IE. So that means its your modem/phone line. Your probably on 28k (Split line) or 56k (only ever connect at less than 48k)
If your pc is slow it depends whats slow. Is your hard drive full? what speed is your processor? how good is your graphics card?. You cant just come in and demand an answer to a question like that without giving us some small hint of what the heck your PC is!. (you installed windows XP on a PI 166 didnt you =P)
Meh if it sucks that bad, burn off all your data. and format the piece of junk =P.