Chances are, you installed AVG antivirus using its default install option.
If so, uninstall it, then reinstall, but select 'custom' install, which then
allows you to forego installing the troublesome email scanning module.

While AVG is uninstalled, try Windows Mail again, just to verify that
the culprit has been found. If not, do you get any sort of error message
when you try to open an attachment? Can you save the attachment?

(Note: it is customary here to quote the message one is replying to.)

--
Gary VanderMolen, MS-MVP (Mail)


"GranUja" <GranUja@discussions.microsoft.com> wrote in message news:CE9B1452-7F0B-47F7-98C5-469147CA3116@microsoft.com...
> ary,
>
> I've had many problems with Symantec, specially regarding the billing and
> registration system they have. So, I don't want any of relationship with
> those guys any more. When I purchased this new computer -October 2007-
> specially asked it with no Antivirus. I'm using AVG Free edition -Grisoft,
> Inc.- for the time being.
>
> The system was ok for the last eight months so I can't imagine why I wake up
> one morning and Windows Mail or Windows Live Mail refuse to open attachments.
> Either the ones I've sent or the ones I have recieved; regardless the type of
> file or the program which should be used to open them or the way you try to
> do so.
>
> My Windows Vista Business is up-to-date.
>
> I've done all posible changes to the configuration of the system nothing
> happens. I have a reasonable experience with software and MS Operating
> systems, but this problem is completely out of hand.
>
> For what I see from the board, I'm not the only one with the problem.
>
> Regard