I am using windows 8.1 64 bit on my desktop and it no longer will run any newly or freshly installed .exe files. The application shows in task manager under the correct name and Icon file but it is using only 1Mb of ram. You can't run the executables as an administrator and changing its location does nothing. I have no idea why this is happening. If any of my hardware matters I have an i7 3770 16gb 1600mhz ram and a GTX 760.