the solution to the yeti problem is :
Go to your my documents/ubisoft/tom clancy......./etc .... u will find a "saved game" folder in there.... cut this folder out to ur desktop....
Than delete the profile folder completely....
Start the game, it will load easily now... start a new campaign and play the first mission again... than quit the game...
put the save game file back to where u cut in the first place...
Now run GR FS and it will run easily....
Hope this helps u out... well it did for me