OK, my 2p worth:
As far as order goes, whilst I have never used Comodo firewall I would still advise having avast installed first.
I have applied that for my Outpost Firewall Pro (or suite) as it detects avast as being installed and offers compatibility mode to disable its web control and anti-spyware modules, etc.
If avast is installed first, there would be less chance of any possible interference from comodo/defence+ during the avast installation. So I would suggest that order of installation and see if it makes any difference.
####
I would suggest that a clean install of avast (as you used to have avast5 on here previously, but I can't see anywhere where you say what version of avast you have) to ensure there is a clean start point:
- Download the latest version of avast, 6.0.1203 and save it to your HDD, somewhere you can find it again (if you didn't save your last download) before starting your uninstall/clean install of avast and comodo. Use that when you reinstall.
- Download the avast! Uninstall Utility, aswClear.exe
find it here and save it to your HDD (it has uninstall tools for both 5.x and 6.0.x).
- 1. Now uninstall avast! (using add remove programs, if you can't do that start from the next step), reboot.
- 2. run the avast! Uninstall Utility from safe mode, first for 5.x if previously installed and then for 6.0, once complete reboot into normal mode.
- 3. install the latest version, reboot.