Do you guys still need any save games from mid-campaign for each or any of the races to help correct the marines not dying? When I get home I'll speed playthrough the campaigns and send em off to you guys.
Tifur, I had the same problem with another trainer. Open up explorer and check out your root directory, should be C:\ if it's default. Go into folder options and under the view tab you need to make sure you have BOTH show hidden files checked, and hide system files UNCHECKED (in 7, maybe vista too).
Now go and see if any hidden files show up in your root folder. Specifically any that are .dll. There is NO legitimate reason for a .dll to be in your root directory. The one I saw that caused me problems was SXC.dll or something like that. I've also see h4x0r.dll too.
Double check that hide system files option, it's what was doing it for me.