I've installed the game before, played it through, beat it, good times.

Recently I wanted to give SoA + ToB another whirl but when I try and install it the game won't run. It finishes installing but then i get a box that pops up that says -1. And the game won't run. Then another box appears saying something to the effect of 'assertion error'...

What's going on? Anyone?

More info please.. An assertion error at which line? What file triggered the assertion error? etc...