Either save the attachments to the local drive and then right click on them and select Properties and click on the Unblock button, or in Word, go to File>Options>Trust Center>Trust Center Settings>Protected View and uncheck
the "Enable Protected View for Outlook attachments" item (and the others if you wish)
I have a new Windows 7 64 bit computer with a new Microsoft Office 2013 installation. Neither MS Word nor MS Excel work with MS Outlook attachments. Any attempt to open such files triggers the dreaded "Windows not working (looking for a solution)" error
message. The work-around described above fixes the problem but essentially you do this by switching off the (non-functioning) Protected View mode of Microsoft Office leaving the computer vulnerable to dangerous files in future.
A patch is needed to Microsoft Office 2013 so that its Protected View mode works.