Microsoft Support

Microsoft Home Page

Sign in

Select the product you need help with

Select a solution

Fix security issues to protect and secure Windows automatically
Diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall and other Windows security options and features.
Automatically fix Windows security settings to keep your PC safe
Diagnose and fix Windows security settings for IE, Windows firewall, group policy, Registry, UAC;check Windows Update and antivirus software status.
Office 2010 Security video: Create a digital certificate now - Office.com
You can create a digital certificate immediately with a few steps. Authenticate your macros, documents and other files.
Expired Certificate and Invalid Digital signature in Word document
Why is the Digital Signature shown to be invalid when the Certificate (signed with) expires? This happens in Office 2007 Word Document. If the Certificate is revoked, it is is understandable to show
Word 2007 blocks for
I have two WinXP laptops with Office 2007 installed. One works perfectly with Office Web Apps. But on the other, when I click on the