Here is the link.
This is the best site I've ever used to tweak my connection. EVER!
This link will take you to a forum. I suggest that you go to the home page from it and then work of of the links provided on the left of the page. I have in the past, used the generic registry spead tweaks on Windows 98 with great results. Usually, I almost doubled my download speeds. I'll save you the trouble and tell you that there is nothing at all you can do to improve your upload speeds (Basically).
http://forums.speedguide.net/index.php?s=
Here is the home page:
http://www.speedguide.net/sg_tools.php