Source engine games error in shaderapidx9.dll

This error affects all Source engine based games, including Left 4 Dead 2, Portal 1 & 2, Team Fortress 2.

In my case the issue was caused by using LapLink PCMover to transfer stuff from a 32bit (older) Windows PC to a 64bit one. This broke part of WMI, triggering some rather weird errors later down the road.