I've just installed Ubuntu for a few days in dual-mode with win7. In Ubuntu, I opened some MS Office 2007 files and wrote reports. After I enter win7 again and open these reports, they all crashed and cannot be displayed
or many slides were missing, became blank

I had saved all files in Office formats already. The fact is they still crash.

Is there any way that I can have my reports back?

Thanks a lot in advance!!