DVD/CD Problem

I have a 6 month old Pioneer DVR-106D DVD Writer. The
problem I have is that suddenly Windows XP stopped
reading discs. I can still use it for burning CDs and
DVDs. I can use Isobuster to read discs but Windows
itself won't recognise the discs.

Here are some of the steps I've taken:
-Tested the drive on another computer - it works fine.
-Tried a different IDE cable
-Uninstalled and reinstalled the drive from system
properties, including physically disconnecting and then
reconnecting the drive.
-Uninstalled any program which uses the drive.
-Disabled the IMAPI service.
-Deleted the 'Upper/Lower Filters' keys in the registry.

When the programs were uninstalled and the drive was
reinstalled the drive worked fine until I restarted the
computer.

The drive is detected by Windows and displays the DVD-RW
icon in My Computer. However, when I insert any type of
disc the icone changes to the of a CD-ROM drive. When I
double click it I'm told to insert a disc. As I said
before I can burn discs with the drive and the contents
of discs are accessible with Isobuster. There is nothing
wrong with the drive itself as I've tested it on another
computer.

There's definitely something accessing the drive because
when I use CloneCD for burning discs it gives me a
warning saying that CloneCD cannot gain exclusive access
to the drive.