Excel - "Cannot open or save any more documents because there is not enough available memory or disk space"

This will also correct "This file originated from an internet location and might be unsafe."

1. Open the Excel file

2. Click File> Options> Trust Center> Trust Center Settings> Protected View (on the left)

3. Un-check the following boxes:
     • Enable protected view for files originating from the internet
     • Enable protected view for files located in potentially unsafe locations
     • Enable protected view for Outlook attachments

4. Click OK