What is an MS-DOS Batch File?
If a .BAT file appears out of the blue, and you’re not on a company computer, your system is infected with a virus, trojan or malware. Got to TrendMicro.com for an online virusscan, and doanload and install a good virusscanner and anti-spyware program http://www.safer-networking.org/ for Spybot S&D http://www.clamwin.