This article contains lists of tools and resources that Microsoft makes available to help you understand how to avoid or remove malware and viruses from your Windows-based computer.
You may experience any of the following symptoms on your computer:
You notice that the computer is unusually slow, crashes, or stops responding frequently.
You cannot start your virus scanner or some system tools, including Task Manager.
You cannot open certain webpages. In particular, you cannot open security-related webpages such as the Windows Update website.
You notice that your web browser's home page has changed unexpectedly, and you cannot restore the home page.
You receive constant and unexpected pop-up windows.
These symptoms may indicate that your computer is infected with malware. However, the same problems might also point to hardware or software issues that have nothing to do with malware. Because it is difficult to determine the reasons for your computer's strange behavior, we suggest that you review the information in this article to determine whether malware is causing the issue. Then, you can use the recommended tools and resources to remove the malware.
Microsoft security-related tools
Microsoft Windows Update
Run Windows Update to obtain the latest updates for Microsoft software, and this includes security updates that are released on the second Tuesday of each month. For more information, visit the Microsoft Update website:
Microsoft Security Essentials is free and can help protect your home or your small business system from viruses, spyware, and other malware. For more information, visit the following Microsoft webpage:
If you think your computer is infected, we recommend that you run the Microsoft Safety Scanner. The scan is free and will detect and remove many of the issues that customers frequently contact us about. To run the Microsoft Safety Scanner, visit the following Microsoft webpage:
Run the Windows Security Center to check the status of several security essentials on your computer. To do this, click Start, type Check security status, and then click Check security status.For more information about the Windows Security Center, visit the following Microsoft webpage:
The Windows firewall is included in most supported versions of Microsoft Windows. The Windows firewall can help protect your computer from malicious users. For more information, visit the following Microsoft webpages:
The Malware Protection Center (MMPC) provides information about protection against viruses, spyware, and other potentially unwanted software. The MMPC also supplies the core anti-malware technology (This includes the scanning engine and the malware definition updates) for the following:
Forefront Server Security
Forefront Client Security
Microsoft Security Essentials
Windows Safety Scanner
Microsoft DaRTWindows Defender
Malicious Software Removal Tool.
For more information, visit the following Microsoft webpage:
The Microsoft Virus and Security Solution Center provides free tools that can help detect and remove viruses. These tools can also strengthen defenses to help secure your computer against viruses and other security threats.
The Microsoft Safety & Security Center has information about Security scanners, tools, and safety guidelines for your computer, laptop, or mobile device.For more information, visit the following Microsoft webpage:
The Security Troubleshooting and Support page has information about free tools that can help detect and remove viruses. The support page also contains information about how to strengthen defenses to help secure your computer against viruses and against other security threats. For more information, visit the following Microsoft webpage:
959318 You receive a fraudulent e-mail message that claims that an attached executable is a Microsoft security update
What you can do to help prevent your computer from becoming infected
There is no method that can guarantee that your computer will be immune from malware. However, there are steps that you can take to lessen the risks. For more information, visit the following Microsoft webpage:
Information about fake virus alerts and rogue security software
Rogue security software, also known as "scareware," is software that seems to be useful from a security perspective. However, this rogue security software provides limited or no security, generates incorrect or misleading alerts, or tries to lure users into participating in fraudulent transactions. For more information, visit the following Microsoft webpage: