Microsoft Malicious Software Removal Tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found. Should any be found it is automatically removed, and a full report displayed on-screen at the end of the scan.
Because computers can appear to function normally when infected, Microsoft advises you to run this tool even if your computer seems to be fine. In addition to using this tool, you should use an up-to-date antivirus product to help protect your computer from other malicious software.
Microsoft releases an updated version of this tool on the second Tuesday of each month, and as needed to respond to security incidents. Download this small tool and your PC will be scanned and checked for malicious software.