Lite on dvd/rw ldw-451s not burning

I have a lite on dvd/rw ldw-451s and for some reason when I put in a cd-r and try to burn something it gives me a message saying
“D:/ is not accessible. Incorrect function” It plays dvd’s just fine,and runs game cd’s,and when I put the cd-r or rw in it spins but can’t read it. I just purchased it with my custom system,so it shouldn’t be burnt out. I can’t remember if I have burnt with it since I got it about a month ago because I have burned things with my other computer i have to transfer files,but I don’t think I tried until yesterday. I went to the website and got the newest flash thing for it. I need help.