there are tons of things you can do.  how fast are your renders normaly for what scenes?  try reducing the samples. how complicated is the scene your using?  unless your rendering in gelato, the graphics card is not important.  

from the size of the memory being used i'd say that the scene is way to detailed.    

try using yafray, its generaly faster.

it could also be a virus.  if its not to much trouble, you could try rendering on another computer or maybe even reinstall windows (or linux, i recomend kubuntu or ubuntu)