no only LFS,and all cars/tracks

hi there,

i got a problem,
lfs succesfully installed,
and last few weeks it started doing weird;
like i race...and then i go to garage,and at the moment i leave,
there comes up a popup shows: LFS stops working,cant find the problem.
i've re-installed it serveral times..but it didn't worked.

could you guys help me fix this problem?

thank you very much.