system
8
The issues are now resolved following the following actions:
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I uninstalled Comodo including Comodo Dragon and Geek Buddy using Revo Uninstaller set at the highest level;
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I re-enabled Windows Firewall temporarily;
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I uninstalled Avast via the Windows uninstall facility and then ran AvastClear with the computer in Safe Mode;
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I ran Rejzor’s Avast Cleanup Tool;
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I undertook a fresh installation of Avast 2014 opting not to add Google Chrome;
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After running a quick scan, I checked the previously non-working aspects of Avast and found that they now worked correctly (automatic updates, creating a rescue disk iso file and email scanning);
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I created a system drive backup image file so that I could return to the current working situation should problems return after the next step;
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I undertook a fresh installation of Comodo Firewall (free) but excluding Comodo Dragon and Geek Buddy;
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I carried out the Avast checks once more and found everything was still working normally.
I suspect that, actually, Comodo had nothing to do with the original problems in Avast but rather an earlier re-installation of Avast had been compromised by Avast residue not removed previous repairs and uninstallations. Although I have always used AvastClear when undertaking unstallation/reinstallation of Avast, I had not used Rejzor’s Avast cleanup tool before. I saw it mentioned in various threads in this forum so decided to try it. Whatever the reason, my Avast issues are now sorted and therefore resolved.