Yeah, you don't want (2) AVs running, but at worst you'd have erratic behavior and "maybe" BSOD. Regarding your AzureWave I remember my "fun" with an HDTV + ATI AIW + ATI TV (PIP) and getting a stable system...been a while.
Just an "Idea:"
You inferred a "restart cycle" ~ seems more software than HW - have you installed/updated any new "media" plug-ins?? I have experienced something similar with Flash; it was a pain to figure-out. I had to fully uninstall ALL Flash components, reset IE, and in my case fixed the issue.
In addition, AVAST "could" have missed some malware; D/L and run the free "Malwarebytes' Anti-Malware" or similar and scan your system. I "get" costs - I'd recommend ESET over Norton, it's worth the $... Update Java and remove older versions.
Good Luck!