We have been having all sorts of issues with IMON just recently at clients with Windows XP SP3 + recent updates Microsoft Firewall Client 2004/2006 (ISA Server) NOD32 2.7 with IMON loaded (even disabled still has problem) There are two issues we have identified, both cause crashes in rpcrt4.dll in the same memory offset, 0007c471 One is that computers will spontaneously have RPC crash and restart themselves, at random moments. We haven't tracked down exactly what RPC calls were being made that cause this. This is the "Generic Host Process for Win32 Services" window crash of svchost.exe that is similar to the old blaster worm problem, but this is not worm related. Uninstalling the Microsoft ISA Firewall Client resolves the issue, but that is not the cause after many hours with Microsoft PSS. Also, we need the firewall client installed to support FTP applications and other programs' internet access through the ISA server. The other problem is a crash in fxsclient.exe when running the Fax Console when connected to a network shared fax server (SBS Fax Services) This also can be resolved by removing the ISA Firewall client. However, the only fix that allows you to keep the ISA firewall client installed is to completely unload IMON from the system and reboot. Simply disabling it you will still get the crashes. We have updated our cfg files to not install IMON, and disable it, and then re-pushed to all the affected client machines. That was the only easy way we could find to fix this on 50+ computers. I am also sending this note to eset support for their comments, but I wanted to post here in hopes it may help someone else.