ANYONE WHO DOWNLOADED THIS, PLEASE UPDATE AND RUN YOUR ANTIVIRUS IMMEDIATELY
this person is trying to infect computers with a virus, possibly of their making, to use your PCs in some way.
if you don't have any antivirus or are not sure, go here:
http://www.microsoft.com/en-us/download/details.aspx?id=5201
and download microsoft security essentials, update it, and scan your PC.