So when ever I open a Excel sheet (2003-2007-2010) it runs a macro and opens a blank excel doc named "PERSONAL." How do I stop it from opening the "PERSONAL" excel file.
press alt-F11 to open the VBA editor from within Excel. Once you're inside press ctrl-F to open the "find" dialog window. Select the "Current Project" radio button to search all modules and VBA objects for "PERSONAL.xls". Keep pressing "Find Next" until you find the line of code that looks like it opens it. You could delete it, but it is probably there for a reason so it may be better to follow amadeus suggestion...