My sony pcv v200g all in one desktop with XP home edition recently stopped recognizing any devices that are plug and play. my flash drive, lynksis wireless adapter, etc. all of the sudden don't work in any of the 4 usb ports. The printer and my dell axim cradle still work in all of the 4 usb ports. I did full a full restore and they still do not work. On device manager there are no yellow exclamations. When I click on the unknown device it says there are no drivers for this device. When you click on update drivers it says the best driver was already being used. Any ideas.