Doesn't anyone bother to scan the file first before launching it?!!
look here...
Most anti-virus utilities (mabye not all) add an item to right-click menu.
All you need to do is right click the file (in this case on the screenshot, it's Stuffplug NG). Then click scan with (in this case on the screenshot, it's Norton Anti-Virus). Then wait...
The results will be displayed. If it's infected, bin it. If it's clean, run it.