During the game or when trying to run DOOM error appears ddknm.sys.
Error This in DOOM happens because lack components for your operating system Windows.
To solve this problem you need install PСKeeper, and check out all the.dll files. If everything is fine to manually install the Feature Pack WinSDK \ Mirror, when you update them rerun the DOOM and ddknm.sys error You will not disturb.
Win SDK he scans your OS windows and update all missing components.