We will need more information to be able to help you:
- Which OS are you using? Is it up to date?
- What avast! version and VPS file (virus database) number?
- Which actions have you taken to try solving the problem?
- Do you use a firewall? Which one?
- Do you have any other antivirus installed in your system?
- Any other security programs that could interfere?
- Any useful information into Control Panel > Administrative Tools > Events, specially 'Errors'.
To know how to post a screenshot, see
http://forum.avast.com/index.php?topic=8982.0You can use Gadwin PrintScreen to get a screenshot (
http://www.gadwin.com/printscreen/) or the free version of WinSnap 1.1.10 (
http://www.filehippo.com/download_winsnap/?2173).
I suggest you search this board for
Yahoo messenger. There should be more users with the same trouble...