Thanks, Lord of the Rings. The files are definitely audio files in mp3 format, play for a short while (in Winamp) then run silently for an age. Clicking on properties shows them to be in excess of 1 Gb and when deleted, the overall size of my My Music folder reduces by an amount which confirms the files Gigabyte status. Since posting the thread I've been told by Master Dogbreath that he has experienced the same phenomenon on his p.c. whilst downloading using Bearshare. I think I've experienced it at least a dozen times. If anyone else out there has had a similar experience, please post, if for no other reason to demonstrate to Lord of the Rings that my sanity is intact!