I have no ideas why would Excel call WinSCP DragExt64.dll. You can try to unregister the DLL to prevent that. As as Administrator, execute:
regsvr32 /u "C:\Program Files (x86)\WinSCP\DragExt64.dll".
Do you know what is like to work hours in Excel and them loose all of your work on a daily basis?
Every time I open up Excel and make modifications to my spreadsheet, Excel falls over and with stop code: 0xC0000005
Faulting module: WinSCP: dragExt64.dll
very frustrating, why the heck would Excel be calling a WinSCP DLL??????