Burning DVD's?

i used to burn films on to dvd-rw then watch them and then re-use the discs
all of a sudden my computer wouldnt burn the dvd’s and then would not recognise them either after trying to burn them, making the disc useless on the computer.
i thought it was jus the disc’s bein old so i tried new ones and even just dvd-r’s but nothing works, did still burn cd’s but doesnt want to do that nw either. i use windows media player but also have tried others including divx player, but nothing…

the error msg i get wiv windows media player is “C00D11E6”

anyone know what to do?