Trend Micro--one of the most respected companies in security software--offers HouseCall, a free Web-based utility that scans for and cleans your computer of all currently documented viruses, Trojans and other malware. In addition, HouseCall seeks out firewall problems and other vulnerabilities, and makes suggestions for correcting them. We do not recommend using HouseCall in lieu of an installed security program. But it has saved our computers numerous times, when all else failed. Its new version is not only compatible with Windows 7, but you can download either a 32-bit or 64-bit version of its launcher.

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Source: Computerworld Unix News