hero.exe won't run

[demishock]

Hi all, long time no see! I disappeared a long time ago because I went on hiatus, and when I came back, I couldn't get the game to run anymore. As there was a lot going on IRL at the time, fudging with the settings was pretty low on my priority list and I eventually gave up.

Cut to today, feeling nostalgic, thinking about trying this out again, still can't run the game. I've tried everything I can think of. I re-downloaded and re-installed the full client, and I can get all the way through the patching, but then it just keeps giving me an error saying "Failed to launch application: heRO.exe". My antivirus (Norton) was getting all ticked off at it initially, so I created an exception, and it stopped making angry pop-ups at me, but the problem persists. When I try to run heRO.exe directly from the folder on my computer, Windows 8 pops up a bar across my screen that says "This app can't run on your PC."

So I'm really at a loss. Any suggestions would be much appreciated.