? about "Sources"

I have been a user for @ one month, and in the past couple days am having many problems downloading! I run on windows me. I keep getting "awaiting sources" message in my download box. Sometimes it happens midway through a download, it'll be downloading just fine, and all of a sudden stop, and I get this message, or it will happen as soon as I click "download". Either way that it happens, it never starts back up. I've waited hours at a time, and still have the same message!! Any ideas!!