I just installed Office 2007 and kept my 2003 version. When running access I get the windows installer each time I switch versions. If running Access 2003 everything starts up normally but if I switch to a file in Access 2007 the windows installer wants to configure and install access 2007 before it opens. If I switch back to access 2003 file the same thing happens with the windows installer. Does not happen with any of the other office products. Any ideas why?