The Intel RealSense driver enables the 3D camera functionality of the system.  Here is Intel RealSense driver for Inspiron.  It supports Windows 8.1, 64-bit in Dell system.
My question is easy so in my Inspiron 2350 Windows 8.1 operating system it shows that the Intel real sense camera driver is part of download for my operating system. I purchased my operating system brand new even though I change the hard drive to solid state. It’s original operating system is no longer with it, so I have tried installing windows eight via original operating system but still it did not work 
Inspiron 2350, Real Sense 3D camera graphics driver