I have 2 computers using AVG Free version 9 with NT7 and I can't say AVG has caused any of my the issues with NT7 I've found. Both are Windows Vista 32 bit. My father had a terrible time with AVG Free 9.0 cashing his computer, and he doesn't use NT. He upgraded from 8.? to 9.0 without uninstalling 8.? first. After uninstalling 9.0 and re-installing it, his crashing issues disappeared. He was using Windows XP.
AVG instructions for uninstall are different in that you run the latest install file and select uninstall that way. We never could get it to uninstall by using the uninstall under the control panel.
I've been using Avira Antivir for more than 8 years and have stuck to it after I carried out a research on various antivirus software/tools (Norton, McAfee, AVG, etc). It has never caused any conflicts with my NT installation or usage. One big pro of Avira is its fast and un-disruptive process of online virus updates against the most recent virus signatures; and its easy configuration setup. I've used the Antivir Personal (free version) for more than 5 years. I've been using the Avira Premium Security Suite (paid for version) for more than 2 years now (on my Windows XP running on my VMware Fusion/Apple Mac machine environment) - I don't need or use antivirus for my Mac OS X itself.
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Having previously worked in IT and computing for many years, I started ditching AVG a few after it left v6 because after that it started doing what Norton used to do, becoming Bloatatious (if such a word exists).
Even the free version of Avira for the 1 day nag screen it has is worth its weight in gold and plus the fact that it is not bloat work and consistently keeps the quantity of processes down and seems more courteous to other startup applications.