I asked questions and that helps me to help you need to answer the one about previous AVs.
I believe your installation is not 100% so I would suggest a clean reinstall.
Download the latest version of avast
http://www.avast.com/eng/download-avast-home.html and save it to your HDD, somewhere you can find it again. Use that when you reinstall. Ensure that you scroll down and select the avast direct download link for the English version and not Cnet as that is for an on-line installation (not what you want to do).
Download the avast! Uninstall Utility,
find it here and save it to your HDD.
- 1. Now uninstall (using add remove programs, if you can't do that start from the next step), reboot.
- 2. run the avast! Uninstall Utility, reboot. If step 1 failed it may be necessary to run this from safe mode, once complete reboot into normal mode.
- 3. install the latest version, reboot.
I really don't see how the problem you have is related to avast especially after uninstalling it.
I don't use AOHell, but I do know aol email program uses a proprietary email protocol and as such wouldn't be scanned by avast's Internet Mail provider.