At least half the Windows Mail problems reported in this newsgroup are
caused by antivirus programs, so you probably need to at least consider
it.
Did you do a default install of avast!? If so, it often helps to uninstall
it,
then do a custom install where you tell it to leave out the parts that scan
email.
http://www.avast.com/eng/avast_4_home.html
The uninstall programs for Norton and McAfee often fail to remove the
parts of these programs that cause problems in Windows Mail, so you
are likely to need to run their cleanup programs if you haven't done this
already:
<
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039>
<
http://service.mcafee.com/FAQDocument.aspx?id=107083&lc=4105&partner=McAfee&type=TS&ia=1>
After this, you may also need to remove your email account under Windows
Mail, then restart Windows Mail and add the account again.
If this doesn't solve your problems, we're likely to need to see the entire
error
messages, not just a quick summary of them, to know just what other help you
need. Right click on them and copy the entire error messages to your next
message.