I tried the first suggestion again no joy, the AVI-MuxGUI i just couldn't understand due no doubt to my advancing years!!
I think the problem lies with the memory stick, an e-bay from china purchase, methinks that its not 16GB although properties shows that it is, because its telling me that its full @ 4GB. The mistake I made was to move 8 folders of finished movies instead of copying them.
When I opened the drive only the first 3 movies were ok when I hovered the mouse over the remaining five I got a load of mandarin gobbledegook.
Thanks for your input but I think I'm floging a dead horse trying to recuva the lost folders.
Frank dommy88 the best motorbike I ever had.