I have reinstalled from the manufacturer's recovery disk and upgraded to Vista SP1. I plug in a USB Memory Stick (MS Heroes as supplied by MS 3 weeks ago) and it is not recognized and then reverts to device installed "unknown device". I have also tried a Seagate FreeAgent Pro Removeable HDD and this says Installing Hardware and then comes up with installed "Unknown Device".
When you look in the Device Manager you can see unknown device sitting there. I have checked to see if there are any irq conflicts (none) I have uninstalled all USB Hubs and restarted, all of the hubs re-appear and when I then try to install either of the above I receive the same messages.
The original fault was that I installed a USB Lexmark printer..........it wouldn't work as the lexbce service had screwed with the print spooler service, hence the restore to factory disk.
Incidentally I have flashed the bios as well which tells me that I have the up-to-date current version!!!!
All this before I finally hope to install a new HP Officejet J5780