Hi Nev,
Thanks for that, I have run scans, everything seems ok. Task manager shows all sorts of stuff running, the most of which is just gobbledygook to me, however I checked out MNSAccessU.exe which is something to do with "CD Burner XP" I opened CD Burner XP and the drive then worked properly. Still working after closing it down but will wait till rebooting to try again. If it does it again I may just uninstall the program.
Many thanks.