Windows 7 Ultimate (Service Pack 1)
Hmm, I'm not sure what's wrong then. If you open a command prompt (shift+right click in the Aground folder, then click open command window here) and type "Aground.exe" and hit enter, does it show any errors before crashing (like ModHandler.hx:95: Enable Mod: Core)? Does it show any more info about the error before you click troubleshoot?