I have mine fixed now.
I have been trying a lot of different approaches to repair the "issue" of Avast taking all of my CPU for approximately 5 minutes upon System Startup.
If I logged into my router it showed quite a bit of transfer, or attempted transfer during this same 5 minute period. Avast also manages to disable the firewall during this time. Just the firewall being down should worry the average user, thankfully most people nowadays run a firewall through their routers as well.
I any case. Getting rid of the problem is easy.
First download the newest release of Avast 5.0462, and save it where you can get at it easily with admin privileges. Simply updating to the newest version DOES NOT WORK!!
After download restart in safe mode, and uninstall Avast through the downloaded installer (clicking install package should give you the option to Uninstall/repair the Avast installation.
Restart again in safe mode, you can start in "regular" if you disable your internet connection (just not wanting any open doors here).
Once again, install the Avast install package. Typical install, make sure you un click the community option if you do not want it.
Restart the Computer, and if you had if disabled, enable the internet again.
This seems simple, and it is, the newest release is really what fixes the problem, but once again, updating just doesn't cut it, you have to completely remove Avast, and re-install.
Brad