dell dimension 560 windows 7 64bit. tried to resolve an issue with usb thumb drive, i uninstalled keyboard driver then after reboot windows could not find usb keyboard driver to reinstall. now all typing has to be done via on screen keyboard. i've spent many hours searching dell for this driver only to find an update that fixes "caps lock indicator". tried getting the driver from the"drivers and utilities" disc but it's not there. please help!