PowerPoint won't start.
Start in safe mode
Try to start powerpoint in safe mode, maybe there is a wrong addin preventing it to load.
To start PowerPoint in safe mode:
- hold CTRL and double click the icon
- confirm message box which asks if you want to start in safe mode
- Using Help->About Microsoft Powerpoint->Disabled Items you can test disabled items
Go to windows control panel -> add/remove programs -> select microsoft office -> select change -> reinstall or repair microsoft office