USB drives changed to PMD after SP1 install

I have a successful (?) SP1 installation. Now Vista prompts for a device
driver for my SATA DVD drive. I am limited to two USB thumb drives and
they are shown as PMD devices in Device Manager. Vista also prompts for
device drivers for these PMD USB thumb drives. If I install a third USB
drive, the storage management window under System Administration shows
the size of the drive, but will not permit assigning a drive letter. Any
suggestions? Also, does anyone know the default settings for Turn
Windows Features On or Off in the Control Panel Programs and Features
Window? The MS Support person I have been working with had me turn all
of these off as part of an unsuccessful attempt to do an in-place repair
using the Vista Home Premium installation DVD.
wajh