How authenicate a Microsoft Update?

We received an email that says Microsoft but it installed a virus called MSOclean. The virus has blocked access to the Internet and all programs. It offers protection for one year antivirus & if not accepted, there is no way around it.  Our hard drive has a partition, the system so I didn't know if I could reformat. Without Internet access, we reinstalled XP from Microsoft, but lost all of our personal files.
Since reinstalling XP, we continue by train a window pop up when you turn on the computer. He says it's a real update from MS, but that's exactly what the e-mail virus said, too. The flight window & star in the form of logos on the email seem to be authentic Microsoft.  Is there a way to authenticate if this window is a real Microsoft Update?  I don't want to go through what happened last time... The virus was so subtle, that he deceived us... Thank you for any ideas or help with this problem.

Microsoft does not updates by e-mail.

After you have reinstalled XP, have you immediately go to Windows Update and get the necessary service packs and other updates to security critical?  See

HOW to get a computer that is running Windows XP Gold (no Service Pack) fully patched (after a clean install)
http://groups.Google.com/group/Microsoft.public.windowsupdate/MSG/3f5afa8ed33e121c

HOW TO get a computer that is running Windows XP SP1 (a) or SP2 fully patched (after a clean install)
http://groups.Google.com/group/Microsoft.public.WindowsXP.General/MSG/a066ae41add7dd2b

What antivirus application do you have?  What's his current subscription?  Have you installed it before you the computer connected to the Internet?

What other anti-malware software do you use?

I suggest that you download, install, update and run analyses with each of the following free tools.  Do not run the scans at the same time.

MalwareBytes AntiMalware
SUPERAntiSpyware

For Windows XP, Windows Update can be configured to behave in 3 ways different (http://support.microsoft.com/kb/306525):

  • Automatically download and install updates (this is what recommends Microsoft and does not require further work or the decision-making process on your part)
  • Download the updates and let the user decide when to install automatically (this requires you to make a positive decision to install the updates, you can see what has been downloaded before installing)
  • Inform you that updates are available (this requires you to manually get updates, for this reason, you can see people recommend its use, because users can forget getting updates after timely notification and thus increase their exposure to malware, on the other hand, it gives you complete control and shows you what are the available updates before download you; otherwise after) you receive the notification, you can manually go to the Windows Update site and make sure you get Microsoft updates and not malware)

Tags: Windows

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