The security vulnerabilities that are addressed by this security update are rated at the highest severity (Critical), and these security vulnerabilities could enable an attacker to take complete control of the computer. The recommendation for this particular update is that you install this security update after you make sure that you have downloaded the update from the Microsoft Web site. You can use the links that are referenced in the security bulletin to download the update from the Microsoft Web site. To install this security update, click the following option when you see the message that is mentioned in the "Symptoms" section:
I trust this program. I know where it's from or I've used it before.
The recommendation in this Knowledge Base article is an exception to the norm. This recommendation should not be used as general guidance for installing other applications or other updates that come from an untrusted source or an unknown source. This recommendation is specific to this update.