I had installed an add-in "Ray's Tools" which created an additional tab on
the Excel 2007's ribbon. However, upon removing the check from such an addin,
in the AddIn's installed, the tab and buttons thereupon are still appearing,
which upon being clicked display a message such a file doesn't exist.

How to disable this AddIn and remove such a tab and buttons thereupon
permanently?

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Best Regards,
FARAZ A. QURESHI