Abnormal Game Exit Detected after each mission/skirmish

[Lusall]

I managed to complete each mission in the Novus campaign and I managed to finish the second mission in the Hierarchy campaign. But now, each time I try to load the next mission, the game simply freezes and it quits to desktop.

It does the same thing after any skirmish game, regardless of whether or not I press play again or go to lobby.

Anyone know what to do? Any help would be appreciated.