Just in case you are not aware of this, there is a virus being sent arournd, pretenting to be from Microsoft itself. The return addresses are a little screwy if you want to look for yourself. It says it is a cumulative update package for all of it's security patches. DO NOT USE IT!!
Delete the message (and attachments if they still hang around). With the constant bombardment of scams, spams, worms and viruses email will soon be a thing of the past. God knows how long it will be before they start attacking forums, listsrvs, newgroups and whatever else there is out there. I guess they've already started.