I have 3 versions of .not framework installed on this computer, and mIRC works with no problem. However, there is a known ntdll.dll problem, I've seen a few complaints about it crashing from mIRC. Sorry that I don't have an answer for you, although I seen to recall that someone had written a wrapper, or some other solution for the problem. Maybe someone else reading the thread has a memory that actually works - mine doesn't.