Locations
United States
Change
All Microsoft Sites
Search
Microsoft Security
Worldwide Security Sites
Home
Security Updates
Products & Scans
Computer Security
Security Centers
Get Updates
Learn More
Security update bulletin
Bulletin archives
Security updates FAQ
Products
Get Windows 7
Get Microsoft Security Essentials
Get Malicious Software Removal Tool
Get Internet Explorer 8
Run remote scan on another computer
Security in Windows 7
Help protect your PC with Microsoft Security Essentials
Security in Internet Explorer 8
SmartScreen Filter in Internet Explorer 8
Security in Internet Explorer 7
Security in Windows Vista
Security in Office 2007
Security in Outlook 2003 SP2
Security in Office 2003
PC Safety Scan
Malicious Software Removal Tool
Need to Know
4 steps to protect your computer
Firewalls
What is a firewall
How to choose a firewall
Firewalls in versions of Windows
Firewalls FAQ
Updates
Get automatic updates
Windows Update overview
Microsoft Update overview
Check your version of Windows
Get Windows XP SP3
Security updates FAQ
Windows Update FAQ
What to do about the ATL security vulnerability
Viruses
What is a computer virus
Computer virus symptoms
Help prevent computer viruses
Remove a computer virus
Help prevent rogue security software
Help prevent IM viruses
Virus protection in versions of Windows
Bluetooth
Worms
What is a computer worm
How to prevent computer worms
Help prevent the Conficker worm
How to remove computer worms
Spyware
What is spyware
Spyware symptoms
How to prevent spyware
How to remove spyware
Spyware protection in versions of Windows
Security Response
Security Engineering
Malware Protection
Products, Updates, Tools, News
What is the Microsoft Security Development Lifecycle?
Learn more about the Security Development Lifecycle (SDL) and how it helps establish security and privacy throughout the Microsoft development process.
Get the out-of-band security update for Internet Explorer
Download and install the update, or check whether it has been installed automatically.
Download free antivirus, antispyware security software
Microsoft Security Essentials can help protect against viruses, spyware, worms, and more.
Automate the process of updating virtual machines
The Offline Virtual Machine Servicing Tool 2.1 replaces version 2.0 and is available as a free download.
CONSUMERS
Get help with security issues
Get Microsoft Security Essentials
Malicious Software Removal Tool
DEVELOPERS
Security Considerations for Client and Cloud Applications
Learn more about SDL and get resources to help you implement.
Microsoft Security Development Lifecycle (SDL) team releases two free security verification tools.
IT PROFESSIONALS
Security bulletin summary
Microsoft Forefront Security
Free security tools and guidance
BUSINESSES
Midsize Business Security Center
Get support, stay informed
Troubleshoot issues by using support resouces
Read and sign-up for Online Safety & Security newsletter
Read and sign-up for our IT Pro Security newsletter
Follow our Security Tips & Talk blog for consumers
Follow all of our security blogs
Was This Information Useful?