I'm working on a computer running Windows XP Pro SP2.  The system has a
Pentium 4 1.5GHz processor, 512MB 133Mhz SD RAM.  I've installed a USB 2.0
PCI card, a Sony CD/RW-DVD-Rom Drive and a Samsung DVD +/- R/RW drive.  The
computer sees all of these devices OK (in harward profiles).

The problems are:

1)  Although the system sees the drives, I cannot (initially) see anything
on the drives when I use Windows Explorer (i.e., My Computer) to navigate to
them.  Nor will an autoexec CD launch when inserted.  This is true whether I
put in a CD-Rom, CD-R or Music CD.  However, if I re-boot the computer with
the disk in the drive, I can magically see everything after the re-boot.  
But, mysteriously, Media Player (for one) will play a music CD even before a
re-boot!  I suspect there is some form of corruption in the OS, but I can't
tell for sure.  I also do not want to reinstall the OS as it warns me the
current OS is newer than one being installed and I could lose everything!

2)  For some reason, I cannot get the USB 2.0 driver to load on this system.
In other words, although the PCI card is USB 2.0 compliant and (I thought)
MS Windows XP Pro SP2 supported USB 2.0, the card acts as a USB 1.1 device.  
Is this because of the motherboard or the BIOS?  Can anyone explain this to
me?

Any help for these problems would be most appreciated!  Thanks