Hi everyone , I am a data analyst and analyst a big stock of data everyday, so i have to prepare a presentation almost in every month. I am in this profession since 12 years , so I have a large volume of power point files in in various format of MS Power point. Since I upgraded my system last month. I use Windows 7 operating system and Intel Quad core processor and installed MS Office 2007. Prior to this I had MS Office 2003 which i used to operate on Windows XP professional edition.I have also used MS Office 97 many years back in my older system. I have ppt files of of 97 version too in my hard disk. But when I try open it in the 2007 it will not open. Can any one give solution to this issue as I need to some research and present a record of all those files.