Cannot find "recalculate normals"

I’m using Blender 2.7.4 with everything set to default (just installed)
and I cannot find the Recalculate Normals option. The Shading/UV tab is not showing up either…

Help me pls

The toolshelf is context sensitive. You are in object mode but recalculate normals affects the mesh faces so you need to be in Edit mode. You will then find the option under the Shading tab

Of course I was in edit mode. No explanation why the tab was gone, but reinstalling blender worked.

Your screenshot in your first post was from Object mode not Edit mode as you’ve just claimed

Compare the screenshots below with the one you supplied