>If you are executing command line commands, you might want to use a batch with the the START command with the WAIT parameter to make sure commands finish before proceeding.

Thanks, before doing an approach like that, I need to make sure that this is really necessary. This is a real mystery. I have been working overnight to try to find the reason for this weird reaction. The WinZip command line utility to unzip does finish before the next line continues, however it has an impact on the memory of the disk for causing such reaction.