What version did you have installed prior to Lightroom 5.7? Can you be specific about the features that you don't see?
Thank you, JimHess,
Pretty sure it was 5.5 (or the latest update before 5.7) in the Develop module I don't see the sliders to control color, contrast, etc. It has very basic features (I'll have to open LR to give a more detailed description.
From your comments I am suspecting that you have lost the basic panel. That's where all of the "basic" controls are. To revive the basic panel:
Mac press Cmd/1
Windows press Ctrl/1
It seems that this has become a rather common phenomenon. There seems to be some keystroke that I'm not aware of that causes the basic panel to become hidden. But it's easily restored.
Note. I just experimented with Lightroom on my Windows computer. Pressing Cmd/1 will cause the basic panel to become hidden if it is displayed, it will display the basic panel if it is hidden.
If you look at the Window->Panels menu, you can see what the shortcuts are to hide/display any of the panels.