Plextor PX-755SA DVD RW and Mass Storage Controller Code 28

Hi,

I've got a Dimension 8300 and I had to fomat and reload windows XP recently.

Everything is working alot better now apart from the two exclamtion marks on my two mass storage controllers, both say the driver for this device are not installed (code28) Been trying to sort this now for a while and am just not getting anywhere.

Also I've got a Plextor PX-755SA DVD RW which I was using before in this machine and now after the reload it just doesn't exsist, I had a look on Plextor web site and all it says there is that Windows should reconise it automaticly.

Any help would be greatfully apreciated.