This sound very interesting and strange issue. There are few things that you will have to check before we proceed in uninstallation and reinstallation of OFFICE 2003 and Office 2007 which I believe will be solution for this issue. First check if it’s only happening for documents which you created in Office 2007.
Also, I have seen its better to install the lower version of software over the latest version.
<a href=”http://findsarfaraz.blogspot.com”>MS Excel help</a>