Hi All, Some backgroud: I have Win XP Home Addt on one drive and Win XP Pro on another drive that i use for programing etc. I recently upgraded to SP2. Problem: None of my USB ports work anymore under XP Pro--no problem under Home addition. This is what I've tried so far: 1. I checked the BIOS and no problem there, although I didn't expect one since the ports work fine under Home edition. 2. I uninstalled all the USB ports in Device Manager, turned off Windows and restarted letting Windows reinstall. Windows did reinstall, but again the ports showed up with yellow tags in Device Manager, and I should point out that there were no entries for ' USB Root Hub', only 4 entries for 'VIA Rev 5 or Later Universal Host Controller.' 3. Uncertain if the lastest drivers were installed for the USB ports, I copied all the USB drivers from the Home editon and pasted them into the system32 folder of XP Pro. I did notice that several of these pasted drivers were more recenet. How that came to be, I have no idea. I repeated Step 2 but with the same result. Any suggestions?