Hi McTam
Following on from what wongm003 said, you could get rid of it by deleting the file altogether (eg via Windows Explorer), but it will be created anew if you subsequently record a macro and choose to save down in your Personal Macro Workbook. Normally, Personal.xls is hidden (hence you don't see it when you open up Excel, although you can unhide it by Windows>Unhide). It isn't really a problem and is actually incredibly useful - it sounds like at some point you have unhidden it and then saved it down so that it opens up visible when you start Excel. If you activate the workbook and choose Windows>Hide then close Excel (and click to Save changes to Personal.xls) it will open up hidden the next time you start Excel.
Best regards
Richard