XP PRO inc

Hello everyone, I have a few questions/problems I'd like some help with. 1a, I'd like to know if it's possible to uninstall XP PRO back to XP Home with preserving settings from before the Upgrade. Both are SP2's. 1b, My Laptop's USB 2.0 doesn't work after installing the upgrade. (weird thing, considering I have one separate USB 2.0 port [on the side] working fine, and two combined [back] aren't. Possibly because they are not located together.) They work all before Windows loads. During loading the two get disabled. 2, Secondly, how do I get to download the file that everyone is talking about: "RVMUpdatepack1.2.2full.cab"? All I get is the home page of this site instead. Thank you all for any suggestions