So, I'm running Windows 7 and Avast 6.0.1125, virus definition 110706-1. I've had some odd behaviour lately. Occasionally, running executables will initiate a UAC prompt for the registry editor. Denying the behaviour doesn't affect the running program. However, out of curiousity, I backed up my registry and allowed the behaviour. The registry edit attempts to disable UAC. This is all new behaviour, so I checked for all Avast updates, and ran a full system scan, which returned zero results. I'm no expert, but it seems like this is the first stage of malware trying to establish itself on my computer. Any advice on what I could do to isolate the behaviour to determine if this is a virus flying under Avast's radar?