Hello Ken Thanks for your help The story is like this : I made exe file --> no problem I made MP4 File --> no problem I watched the exe file and find a few slide to improve (increase slide time in order to have enough time to read the comments) right after, rebuild exe file --> no problem Right after, rebuild MP4 file --> problem occurs So my PC is running under Xp with 3 Giga ram and I use to build a lot of MP4 file with this configuration.without any problem Temp memory has not been change as I know. nobody else than me is using this computer. Nevertheless I can increase the temp ram, Do you know how to do that? My hard disk free space is 7.4 GO My hard disk D sapce where I build MP4 file in 104 Go It seems to be OK