Hi LouisDVF, if you mean you cannot find the icon to start PowerPoint:
Click your Start Button, type powerpoint
If PowerPoint appears in the search list, right click it and choose 'Pin to Start'
If you then want an icon on your desktop, drag the new PowerPoint Tile from your Start Menu onto your Desktop
Otherwise:
Try repairing your Office installation . . .
Open Control Panel - Programs and Features
Click Microsoft Office in the list of installed applications
At the top, click 'Change'
On the resulting dialog, click 'Repair'
That should fix any issues with your Office Installation . . .