Hi yesterday i started downloading 2 Big files. They are both @20 % but someone disabled my internet connection. This morning when i wantet do download the files are both @0% . Why ???

The only reason this might happen is if LW was not closed down properly before the comp was shutdown. Or your comp crashed. If either of these things happen then the downld preferences will corrupt. There's not much you can do about it. You can try to resume them this way. Stop them from the downld window. Search the movie again & if you see an icon next to the file with a ripped paper it means you can continue it by reselecting to downld.
The other way is to go to the library incomplete folder & resume it. But this is often not successful in resuming from where it was.