I have the same problem as the OP. I have the Collectors Edition (disk). I've played it since launch, but this past week or so the game won't launch. It shows up in Task Manager processes but it doesn't start.
I tried renaming igo32dll. That didn't work. Then I tried to move it to my desktop as you did. Didn't work.
Last night I got the game to launch, but it took about 8-10 min before it started. This is really, really odd.
While checking out possible answers, having left the process running in Task Manager, the game now suddenly started. I figure it took about 10 min this time (about the same as yesterday).
