Magician

Does anyone know what this pop-up means? It comes up twice, on for each DVD drive I have in my system and then tells me that there are no writeable DVD drives in my computer. The drives are ok (As far as I know) I can burn successfully with them via Nero. Its a SHW-1353 (I think thats right) LG drive Windows XP Home SP2 And I have burnt many DVD successfully with imgburn, but all of a sudden its started to play up. Any sugestions would be most welcome.