Play only partial of completed file

[basssparks]

Aftere some experimenting with different and seemingly illogical methods to get a dependably stable connection while downloading MPG files, it seems I have stumbled upon a 'sometimes' remedy: after signing on to limewire, I disconnect from the network immediately after activating desired files, and the connecton, tho reading "disconnected", keeps downloading for sometimes as much as few hours, if I don't play around with previews or changing status of active files. It the modem connection is lost, I simply quit and restart AOL and the Limewire downloads begin again automatically. No sense of why this works.
NEW PROBLEM: After getting the full downlaod on a file, sometimes as large as 120MB or more, I cannot dependably get the whole file to play in Quicktime, where it is automatically placed. When I hit 'launch, I mostly get only a very short preview of the complete file. Any suggestions?
Thanks.