Error opening Excel 2013

I must have done something because every time I open Excel 2013 I get this message:
Invalid formatHow do I fix this please?
Frank FreeseAsked:
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JohnBusiness Consultant (Owner)Commented:
I suggest you uninstall Office completely, shut down, start up, install Office again, update (to right now) and see if that fixes the issue.

If you have the same issue, try:

1. Restoring to a prior point (Windows Restore) and
2. Making a new Windows Profile. Make a new, test Windows User Profile (Account). Log into the new account and test Excel in the new account. You may have a damaged profile.
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Ryan ChongCommented:
try check and if necessary, delete the PERSONAL.XLSB in this folder and then try start your Excel again see if problem is getting resolved:

C:\Users\<username>\AppData\Roaming\Microsoft\Excel\XLSTART

further reading:

Where is the Excel Personal Macro Workbook Located?
http://wheatblog.com/2011/08/where-is-the-excel-personal-macro-workbook-located/

Copy your macros to a Personal Macro Workbook
https://support.office.com/en-ca/article/Copy-your-macros-to-a-Personal-Macro-Workbook-aa439b90-f836-4381-97f0-6e4c3f5ee566
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Frank FreeseAuthor Commented:
that was the problem - thanks
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