Programs doesn't want to burn on my DVD+RW

I have 3 DVD+RW disks, and i have emptied all of them several times now with both Nero and Alcohol 120%, but both programs refuse to burn on then. Nero says i still have files on the discs, which i don’t, and that the imaginary files will be deleted if i continue. I click yes, but then it repeats itself with telling me the disk has files on it. I have formatted the discs entirely several times now.