Hi,
I've been using HookAPI for a long time and for many hooks. I've never seen such thing: a crash occurs during the HookAPI, inside the madchook code.
Only on a specific machine, and only on Shell32.dll functions.
The crashing processes are random, and are services (System processes) -- I don't know if it's by chance or if it has a specific reason.
I uploaded a screenshot of this dump:
http://www.trustware.com/RPCSSCRASH.JPG
Any ideas??