Why won't windows dvd maker burn my disc?

[thewierdninjawolf]

This morning i was trying to burn a disc for school, but it said, "A Dvd burner was not found. Please make sure a Dvd burner is connected and installed." BUT IT NEVER DOES THAT! I've burned lots of discs before! It never does that! Why? My disc is blank! It's a dvd-R disc! Help please!