Hi @glennyboy ,
Did you use 32-bit version of Office?
Did this problem only appear in specific Excel Workbook or all Workbooks?
Where did you save the Workbooks?
I suggest you try to run Excel as an administrator and test if this problem still existed.
You can also refer to this support article:
https://learn.microsoft.com/en-us/office/troubleshoot/excel/available-resources-errors
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