Poisoned declare statement

Question

This DECLARE statement (part of a set of statements in my declarations) used to work just fine in Excel for Office 365. Now, putting it into a brand-new spreadsheet--just this line alone--causes sharing and access violations that prevent me from even saving the file:

Private Declare Function apiShowWindow Lib "user32" Alias "ShowWindow" _

            (ByVal hWnd As Long, ByVal nCmdShow As Long) As Long

Again--this single line of code, inserted into a VBA module that otherwise HAS NOTHING ELSE IN IT, causes the problem. I have already tried the modification below, and that doesn't help either. Can someone help? Thanks!

#If VBA7 Then

Private Declare PtrSafe Function apiShowWindow Lib "user32" Alias "ShowWindow" _ (ByVal hWnd As LongPtr, ByVal nCmdShow As Long) As Long

#Else

Private Declare Function apiShowWindow Lib "user32" Alias "ShowWindow" _ (ByVal hWnd As Long, ByVal nCmdShow As Long) As Long

#End If

Answer 1

If you can't save a new file with just that line means for me you have some trouble with your virus scanner or other 3rd party security tools.

Please follow these steps:

Close Excel
Press and hold the CTRL key
Open Excel
Wait for a message to appear and ask for "Safe Mode"
Release the CTRL key
Click Yes
After Excel opens
Test the behavior

Andreas.