Do not count on Windows to be fully up to date when it comes to device drivers
Go to the vendor site to be sure you have an updated driver for your graphic adapter
•nVidia Driver Downloads http://www.nvidia.com/Download/index.aspx?lang=en-us
•ATI Driver Autodetect http://support.amd.com/en-us/download/auto-detect-tool
There are also intermittent reports that the newest driver is not always the best driver due to driver bugs or compatibility issues, so you MAY need to try an earlier driver version
PrPro uses the GPU only for those things on the GPU Accelerated list ...
GPU Accelerated Effects: https://helpx.adobe.com/premiere-pro/using/effects.html
So if you don't have color work, Warp Stabilizer, the other things, you won't see much GPU activity at all. Another thing causing consternation is the phrase "software only" in the Summary section of the Export dialog box. That does NOT refer to shutting off the GPU, but only ... and specifically ... that your CPU doesn't have the QuikSync hardware encoding node which is a very new thing in Intel CPU's. A lot of people see that, and think it means their video card isn't being used ... not the case. Has nothing to do with the use of the video card.
So ... those two caveats in, what's your OS/CPU/GPU/vRAM, and what effects are you using on your sequences?
Still having this issue, nidhinp? Let us know.