Thanks for that Wombat. Id deleted both the reg keys but there was another I needed to delete as well. Basically even though I had deleted the filters one of the keys still said CD-ROM so I deleted that as well and rebooted. All fine now.

There were quite a lot of suggestions on the Knowledge Database but most were for XP and the 2 for Vista were strangly missing. Hahaha thanks again Microsoft (sarcastic face)