Scan your files for Viruses before Downloading or Installing them

Use this online virus and spyware scanner before downloading or installing a file: https://www.virustotal.com/.

Simply input your file location or a URL, and VirusTotal will compare it against 30+ antivirus engines (including McAfee, Kaspersky, etc.) to help detect viruses, worms, trojans, and malware .

Source: http://www.makeuseof.com/dir/virustotal-online-virus-spyware-scanner/

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Installing Microsoft Security Essentials

Currently I use Norton Anti-virus which is included free with my Comcast internet connection (but I do not use their Constant Guard due to all the problems with that app).

But if I decide to go with a new Anti-virus, will check out Microsoft Security Essentials per this Ask Leo! post.