From: roger@burgess.nildram.co.uk   
      
   I have seen a lot of reports about the SIS 7100 chipset causing   
   problems in windows XP. Unknown Device keeps popping up when a USB   
   device is plugged in, my fix (the 1 that worked for me) open control   
   panel got to system open hardware then goto device manager and look at   
   the properties of the device Generic Composite USB Hub (or the top   
   level device) under the details tab you will see a number like   
   PCI\VEN_1039&DEV_7002&SUBSYS_80871043&REV_00\3&61AAA01&0&1A (mine)   
   yours will be different   
   use Regedit and search for this string and delete it.   
   uninstall the usb device . Scan for hardware changes and the USB   
   device will re-installl and all your unknown devices will be reconized   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)