Launcher has encountered a problem and needs to close ....

Bought through Steam early July, ran great on Quad Core .... lost motherboard, had to get new power supply, MB and AMD FX 6 Core ... Launched steam from old drive in as slave .... most games run fine w/o re DLing ... CoD (and WoP) both sadi there was new game content neded, and it DL'ed something through steam ... I believe it updated CoD as well as .net to .4.0 .... .... Now it crashers with launcher error after loading thermaste .. just before I would see the inside of the cockpit ....



I verified game data, I uininstalled, re-installed through steam, removed .net4.0 (and the game wouldn't at all) re-installed .net 4.0 and it still gives that error right at go time! .. I payed $50 for this title and meet all specs .... I read once that there might be an issue with AMD FX? ...

PLEASE help! ... it was hard to shell out that kinda cash but I wanted it real bad .... now I'm on newer faster hardware and it launcher crashes! Could someone please help me get it going again? .. Thanks SO much - Darrin