I have a program which was developed in Excel 2003. It has always worked fine on my web book using Excel 2007. All of a sudden, whenever I try to enter data anywhere in the file I get an error screen which says "Can't find Project or Library". I tried replacing the file thinking it night be corrupt, but I keep getting the same error message. I clicked on the help screen but I'm not sufficiently experienced with computers to even understand what help is talking about. Anyone have any suggestions?