While trying to create macros but being very inexperienced at it, I have apparently messed up my PERSONAL.XLSB file somehow. When I try to record a macro, I get the error message: "Personal Macro Workbook in the startup folder must stay open for recording." That is after clicking the record macro button on the Developer menu, typing a name in the dialog box, then selecting "Personal Macro Workbook" as the place to store it.

I noticed also that the "unhide" button in VIEW is unavailable, so I must have deleted the PERSONAL.XLSB file where I can put my macros. And the odd thing is, now when I open Excel by clicking on the Excel icon (not from opening an existing file), the default filename at the top of the file is PERSONAL.XLSB instead of "Book1.xlsx". But, if I go from there to create a NEW spreadsheet file, it calls it "Book1.xlsx" as it should. How can I fix all this? Thanks!