If there's one golden rule about antivirus programs, it's that you must never install more than one. These programs generally work by intercepting all the file activity on your PC in order to trap viruses as early as possible, and Windows does not take kindly to having multiple programs each fighting over the same file.
This generally means that you're reliant on one vendor's AV and malware scanning technology to keep your PC safe. Which is way better than nothing, but it's always possible (and sometimes desirable) to go one better.
Kaspersky Security Scanner is on-demand program which checks your PC for viruses, malware, and a host of other potential security problems. The "on-demand" bit is important - it only scans when you run the program, rather than continually running in the background. This means that it will happily co-exist with your existing security software as a handy second layer of defence. Just run it manually by double-clicking its icon every few days.
KSS is free, and you can get it from http://usa.kaspersky.com/downloads/free-anti-virus-scan
It should work with all recent versions of Windows. The installer weighs in at a tiny 0.2 MB, which is vrius-free according to Virus Total. However, be aware that the installer will download an additional 55 MB of files when you run it.
Unlike some antivirus products, KSS detects more than just viruses. It'll also warn you if, say, your web browser is configured in anything but the most secure fashion, and even if your PC is set to allow CD-ROMs to auto-boot. It won't fix these problems, but will happily provide a link to a paid-for Kaspersky program that can. But even allowing for the blatant promotion, this freebie is actually a very handy addition to your security regime and is well worth a download.
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