After the BIOS upgrade, my USB device is not working.

Enter CMOS Setup. If USB is built in, make sure the On Chip USB Controller
is Enabled. This setting is usually under the Integrated
Peripherals screen. Also, make sure that the 'Assign IRQ for USB' setting
is enabled (PNP/PCI Config. screen).

If a USB card is being used, then make sure that the card is being detected
by the BIOS and is configured properly (drivers installed, etc.).

If the problem persists then for windows 95/98/ME try the following
1. If possible copy the windows CD to a directory/folder on the hard
drive. (you may temporarily lose access to the CD) (win ME skip this
step)
2. Boot to Windows. If you cannot boot to normal mode then boot
into �Safe Mode�
3. Open the device manager
4. Find the �System Devices� key.
5. Remove all entries under this key.
6. Shut down the system and restart. Windows should redetect all the
devices, and set them up properly.

for Win 2K/XP
1. Boot to windows CD
2. Procede until licence agreement.
3. the install procedure should say searching for previous versions of
windows, and then give an option for "Repair an existing installation"
select this option and continue.