In your Z: folder you will see some shortcuts and files.
Go into the folder set up Word, PPT
Drag just the PPT UI file over/into the shortcut for Office.
Your Home tab should look like this (seeing all the tools in the Slides section).
If you've tried the above steps, and your Home tab still looks like this (with Slides collapsed, and the extra sections (purple) and extra tabs (orange), then follow
the steps below.
Go to Customize Ribbon on the left...
When you've done that, click on OK. When it asks you to replace, say Yes.