Thanks for helping me out. I was beginning to think this post was going to be lost in obscurity.
First, Aug 16 is indeed the last dump. I didn't save the files from the first BSOD, and since the one on the 16th I had asked a few friends for help but they weren't able to, so I posted here.
This probably seems like a no-brainer, but is it really worth changing AV products over isolating the problematic update and not applying it? I've used AVG since XP days and I really like it. It's not really sentimental; I just like the interface and its worked great for me up to now. Having said that, I've heard good things about Avast so I'm not against changing for better stability.
Thanks for the info about AV uninstall. I use CCCleaner for uninstallation and knowing it's much better than vanilla Windows add/remove, I assumed it would be fine for pretty much any program.
I may have solved the plug n play issue. I was in msconfig and noticed I had 2 startups for my Logitech SetPoint software. There definitely weren't 2 last time I checked, and one looked suspect. I disabled it, and its still working fine, so we'll see if that sorts it out.
If you can answer my question about changing av vs. ignoring problematic update, I'll get on to testing.
Thanks again for your help. It is very much appreciated