Vlk
8
It would be best to (under Admin account) uninstall the old version, even run aswClear (http://www.avast.com/eng/avast-uninstall-utility.html) and then install the latest version again. This way, you can confirm/deny that the problem was indeed fixed in the latest version (that is, make sure that the new problem is not somehow caused by the previous version’s one).
Thanks
Vlk