Looked through your file that you provided and did not see any glaring problems. Actually looks pretty good generally.
I did notice what looks like some remnants left over from a previous install of AVG so if you've performed an uninstall from the control panel you may want to also consider running the proprietary uninstaller found
here just to cleanup the leftovers. I see it looks like you're currently running Avast and I haven't heard of that product causing any such problems.
Since the problem seems only to be impacting your installed browsers try running IE8 without addons, Click start, All Programs, Accessories, System Tools, Internet Explorer (No Addons), additionally consider returning IE8 to its' default condition. Control Panel, Internet Options, Advanced Tab, click restore advanced settings and then the Reset button.
Lastly you're using a program that I'm personally not familar with that is running a service called IS360service, a product associated with IObits 360 security. Consider using the services console
type services.msc into the search box and hit enter
scroll down to IS360service, double click it and set the startup type to manual and stop it, just to see if it may be an issue. Seems like an anti-malware realtime scanner, and some of these programs add BHOs (Browser Helper Objects) that can prove problematic in some cases.
Keep us posted.