Can not open PPT

 Can not open PPT

Symptom: 

When opening a PPT, 'PowerPoint found a problem with content in xxx.pptx. PowerPoint can attempt to repair the presentation.

If you trust the source of this presentation, click Repair.'

After you click 'Repair', you get

'There was an error accessing xxxxx.pptx.'

If you click 'Show Help', you get

'This error can be caused by the following conditions:

. Your hard drive or floppy drive has a corrupt section (damaged track or sector).
. A temporary operating system or network failure has occurred.
. Your network is unavailable, slow, or is corrupting data packets (failure of a router, network card, or noise on the network transmission line).
. Your antivirus program may be causing problems accessing certain files.

In the case of a damaged disk, you must save the file to another location (for example, a different drive).

In the case of a failure of the operating system, ...

If the network is experiencing problems, ... consult your network administrator.'

You click OK, you see nothing.

Solution: 

Click 'File -> Options -> Trust Centre -> Trust Centre Settings... -> Protected View',

Clear all the tick marks. Click OK.

You open the .pptx file fine now.