Game Load to 95% and Freezes’

[brp51d]

I am having this problem about 50% of the time missions load to 95% and bar keeps repeating to that point. I must exit game through task manager. I have Russian version. This problem started prepatch. I was only able to fix it by deactivating and reinstalling. It happens on all missions with Spitfire 1a and 2a. I turned off grass,triedrepair and received error message. Had steam check files which came back without problem. Set game native resolution. Problem continues.

specs:I7 @3.9
Win vista 64
6 gigs ram
gtx 580 vc