Hello everybody !
Thanks you guys for your help...
I downloaded and running µtorrent. It works very well !!!!! about 4x or 5x faster than LW 5 for the same file ! Some good priority options, well it's a good soft !
I'll have a "LW5 pro" one week old for sale...
I found how to retrieve my old files with LW (for someone is interesting).
When i was searching files, i was downloading the .torrent, then open and download it with LW.
I searched all my .torrent on my HD (i choose not to delete them on my system). I tried to put a .torrent (from a previously partially downloaded file) in LW.
LW has restarted this file not from 0 but the previously downloaded size. Victory !!!!!
But finally, i decided no restart all my files with LW but µtorrent...

Because he is faster, it will take less time to redownload all my current files from 0 !
Thanks for those who helps me !