Today, I got a similar error message when trying to run the Microsoft Excel: Power Pivot Add-In (and selecting the Manage icon to manage an existing Power Pivot Table).
Malicious Memory Protection: Exploit Code executing from Heap Memory Blocked - Location Microsoft Office Excel.
Note: Power Pivot is a Microsoft Excel add-in designed and developed by Microsoft that is part of Microsoft BI. Power Pivot is an add-in you can use to perform powerful data analysis in Excel. The add-in is built into certain versions of Excel, but by default, it's not enabled.
