AVG is known to have severe compatibility issues with CHU's trainers. It's recommended you use a different AV product.
Never had a single problem with any CH file VS my AVG, as long as I get the matching version of trainer - game, every trainer works with no issue whatsoever, and my AVG is always on. I even wrote a guide on how to get trainers running alongside AVG! Thought I'd upload it to save people some hassle
[Edited by FireflyPoi, 8/12/2010 8:25:39 AM]