cable/DSL optimizer...

I found this a while back and have been having great results
without having to bother tweaking the XP registry.
I've had the best results with clicking the "optimal settings"
radio button on the bottom right hand corner.

http://www.speedguide.net/downloads.php

and to optimize bandwidth....
first create system "restore point"

1. log on as "Administrator"
2. start - run - type gpedit.msc
3. expand the "local computer policy" branch
4. expand the "administrative templates" branch
5. expand the "network branch"
6. highlight the "QoS Packet Scheduler" in left window
7. in right window double click the "limit reservable bandwidth" setting
8. on setting tab check the "enabled" item
9. where it says "Bandwidth limit %" change it to read 0
10. reboot