memory - Persistent massive non-paged pool

Right, I've had to do this to remove a memory leak problem from the LAN driver + windows 8.1 which showed itself when I download things from steam.

Now I have played Alien: Isolation and had a very similar problem: the RAM usage sky-rockets and I have to quit before the PC becomes unusable. Even if I restart the non-paged pool remains at 4.3GB and so my usage remains at ~73%.

Firstly, how do I "reset" the non-paged pool?

Lastly, what is going on here?

This is a new build (http://uk.pcpartpicker.com/user/lucidnonsense/saved/YPddnQ)

Memory stuff (after a restart):

8.0 GB DDR3
Speed:  1333 MHz
Slots used: 2 of 4
Form factor:    DIMM
Hardware reserved:  139 MB
Available   1.9 GB
Cached  618 MB
Committed   6.5/9.7 GB
Paged pool  175 MB
Non-paged pool  4.3 GB
In use  5.8 GB

DXDIAG stuff (notice all the RADAR_PRE_LEAK_WOW64 problems in the diagnostics below)

Edit: also the memory diagnostics tool turns up nothing though it does reset the memory

Answer

please take a look at the following.
There is explained how you can identify what is causing your memory leak.
http://msdn.microsoft.com/en-us/library/windows/hardware/ff560135(v=vs.85).aspx