Think I has sussed it,when I played the clips on next doors puter the phone was still connected to it via the USB,it obviously drew the files from that and used the Nokia multimedia player whereas when I tried playing them on my machine I had just copied the folder containing the files across to the desktop,so when I opened them my machine tries to play em using Totall Video player, the phone uses summat called 3gp file format,file converting utilities are available to download so I'm gonna try that later.
One shall report back the results.
Tony