The other suggestions look spot on:
- D:\Users\Robert\Documents\Native Instruments\Guitar Rig 5\Sounds looks right
- Freezing definitely works
 
What version of Guitar Rig are you on? Because the structure is ever so slightly different on 3 and 4.
 
ProcMon is a very powerful piece of software but it's not for the faint heart-ed, I'd try the other suggestions first.