It is strictly a post-infection removal tool. Therefore, we strongly recommend that you install and use an up-to-date antivirus product. If you like, Windows 10 already has Windows Defender Antivirus included for antivirus. The tool removes malicious software from an already-infected computer. Antivirus products block malicious software from running on a computer. It is significantly more desirable to block malicious software from running on a computer than to remove it after infection.
The tool removes only specific prevalent malicious software. Specific prevalent malicious software is a small subset of all the malicious software that exists today.
The tool focuses on the detection and removal of active malicious software. Active malicious software is malicious software that is currently running on the computer. The tool cannot remove malicious software that is not running. However, an antivirus product can perform this task. The Malicious Software Removal Tool runs in quiet mode in the background. If it detects malicious software on your computer, the next time that you log on to your computer as a computer administrator, a balloon will appear in the notification area to make you aware of the detection.
If the tool finds malicious software, you may be prompted to perform a full scan. We recommend that you perform this scan. A full scan performs a quick scan and then a full scan of the computer, regardless of whether malicious software is found during the quick scan.
This scan can take several hours to complete because it will scan all fixed and removable drives. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed.
Microsoft releases an updated version of this tool on the second Tuesday of each month, and as needed to respond to security incidents. Note The version of the tool delivered by Microsoft Update and Windows Update runs in the background and then reports if an infection is found.
If you would like to run this tool more than once a month, use the version on this Web page or install the version that is available in the Download Center. Because computers can appear to function normally when infected, Microsoft advises you to run this tool even if your computer seems to be fine. You should also use up-to-date antivirus software to help protect your computer from other malicious software.
You can also perform an online scan of your computer using the Windows Live OneCare safety scanner. Download Certified Similar to 3. For example, one of the resources is a file in an archive. If the Microsoft Windows Malicious Software Removal Tool notifies you of an error and gives you instructions, follow those instructions.
If there are no instructions from the tool, you can look for instructions in the log file for the tool. To do this, follow these steps:. Locate the most recent entry in the log file. This entry is typically the last entry in the log file. You may have to scroll down to the end of the log file to find this entry. This log file is available only in English. Follow any instructions in the most recent entry in the log.
If there are no instructions, note the error code number and see the 'How to troubleshoot specific errors' section. During a scan, Microsoft Windows Malicious Software Removal Tool detected malicious software contained in a file archive, such as a.
You should determine whether the file is malicious software, and remove it from the archive manually. Search the Microsoft Malware Protection Center encyclopedia to see whether the file is listed as malicious software. To do this, visit the following Microsoft Web site:.
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