Are you saying that this happens when you are trying to send or receive email? If so, is the mail scanner running? What firewall are you using and is ashMaiSV.exe allowed through the firewall?
If the above is not relevant to your problem, please give more information or state the problem in different words.
Everything was working a treat (which is where I need to say how great Avast! is by the way :)) and then the other day I tried scanning an image (Epson Scanner) and tried to send it via. email which it said it had a virus in it. Since I just scanned it I doubted this and skipped it to try and send, however it refused to send the email.
Now whenever I try to read or send an email the pop up error occurs and I need to close off the box three or so times until it allows me to send or receive. Doesn’t matter if the email has attachments or not. If it has attachments it says it cannot scan attachment.
Mail Scanner is on and everything updates so I assume it isn’t blocked anywhere.
There was some security on there from BigPond (ISP in Australia) but that was removed (including reg entries) and then Avast! was installed. It was fine for about the last three weeks or so (since I installed it) but as above, I tried to scan and send a document and it all went pear shaped from there! I might just have to uninstall it and re-install it again.