i have 48 avi files and this is what happened with 32(they were all in the same folder)

i tried to open one file and i got a message: ''access denied''

than i tried to open all other files but i got the same message

i converted ntsf partition on which all avi files were to fat 32

i tried to open all avi files then but i got message this is not a valid avi file (in divx player) cannot play bak file.the format is not supported (in windows media player) can not determine file type (virtual dub)

i tried to fix this with DIVFIX,VIDEO FIXER and there was no success.

then i tried to analyse it with AVI INFO and AVI INFO didn't respond

i started GSPOT and then i opened all files and the message was:not a valid avi file:bad header

other 16 files work fine

all files were encoded by divx 5.0.5 codec

HOW CAN I REPAIR THESE AVI FILES