Hello,
it's now more than 1 month that i didn't play lfs anymore, because of when i play, lfs close and turn back to desktop.
At 1st i was thinking of not supported drivers on win7 rc1, but i tried new and old one and it still the same, after i think about win7 rc1 was maybe not fully compatible for lfs, then i installed a newer build (build 7232 64bits), same with lfs, this morning i tried to reinstall lfs from 0 with not patching the z13, and it's the same, lfs keep close and turning back to windows desktop, it happend sometimes after only 1min of play and sometimes i can play more than 1hour before the crash comes.
my config:
windows 7 build 7232 64bits
core2duo e6850 3ghz
asus Maximus Forumla motherboard 
4gb ddr2 ram
2 x 150gb raid 0 (system)
1 x 750gb (data)
GeForce 8800GTS 512
Problem signature:
  Problem Event Name:    APPCRASH
  Application Name:    LFS.exe
  Application Version:    0.0.0.0
  Application Timestamp:    486b6f3b
  Fault Module Name:    LFS.exe
  Fault Module Version:    0.0.0.0
  Fault Module Timestamp:    486b6f3b
  Exception Code:    c0000005
  Exception Offset:    000f6c49
  OS Version:    6.1.7232.2.0.0.256.1
  Locale ID:    4108
  Additional Information 1:    4709
  Additional Information 2:    4709938665fa84e3ff99c8cbe11223bb
  Additional Information 3:    4ce4
  Additional Information 4:    4ce4c8d47c92151b30815d7a027c2228
i hope someone will have a solution for me 
sorry for bad english