GSA-E40L Problem, can't figure it out

Alright, so I have a problem I can’t figure out, and I have a project due on Monday.

Basically, I have an LG GSA-E40L and have never had a problem with it. I burn a lot of DVD’s and it has always worked for me. But, within the past two weeks, I tried burning a DVD, and it refuses to burn. I went into My Computer, and instead of saying it was a DVD burner, it said CD Drive (F): It won’t burn DVD’s anymore, and I’m not sure what I could do to fix this. I’ve tried uninstalling it, but it hasn’t worked, or I just dont know how to do it. how do I fix this?