First off, who in the world told you that SP-1 could upgrade your USB ports? If you have any questions to ask about your computer, AVOID THAT PERSON AT ALL COSTS!
You cannot upgrade your USB ports by installing ANY software fix. It is hardware and if you want USB 2.0 ports, you're going to be in the market for either a PCI expansion card with 2.0 ports on it or a new motherboard.
<font color=green>===</font color=green> Never assume <font color=red>ANYTHING</font color=red> <font color=green>====</font color=green>