Doesn't sound good. Tell you what. Go to LW's Library window & select the incomplete folder. Arrange by size by clicking or double-clicking the size column. Then delete those that are zero or less than 30 KB. But you should also delete the same from the downld window for best performance.

There's still the off-chance one (or many more) of those incompletes in red will continue once you search the sources & find the right one. I've had red ones start downlding before. But better to concern it with those already partially downlded than those that have had 1% or less than downlded.