NOD32 will work just fine, with a slight catch
IMON has some issues with a couple server type applications (not many, but there's a couple, and Apache is one of them.)
You have two options.. you can recompile ibapr.dll with the WAIT_FOR_EVENT preprocessor definition defined, which is probably going to be a major pain in the butt.
The easy way, bring up the NOD32 control panel and go to the IMON settings. On the miscellaneous tab, hit the "Exclusions" button, and add the Apache executable. Once it's in there, restart. Problem should be solved.
(Personally I'd stick with NOD32, it's one of the fastest and smallest, plus they rate at the top for virus detections.. used to use Norton.. what a bloated piece of crap that is)