You can always start with defragmenting your HDD. Windows's HDD's become easily fragmented with partial downloading which is what gnutella offers. I'd recommend downlding to a different drive or partition but if you don't have that option then defrag your HDD often!!!! & check your system over to make sure it's ok!

If you have your itunes set for import on addition of file then your video file should have been copied into itunes. If you have itunes 6 or later then look in your video folder (playlist) for videos successfully imported!

For windows your videos need to be either mpeg 4 or H.264 format!!!