This may not help but........if your Win7 is 64bit....
I found a patch (4gb_patch.exe) in the misc files folder of the new Historix mod (V1.9) and a text file which reads.....
"32 bit programs can't be loaded to the highest section of the RAM on Windows 7 x64 systems. They are kept below the 3.5GB RAM limit that 32bit OS have, even if Windows 7 x64 can use more memory.
This program will allow you to patch rFactor (or any other .exe file) so Windows 7 x64 systems can load it over that 3.5GB RAM limit. Otherwise if you load too many cars the game may crash to desktop with a C++ runtime error.
If you're not using Windows 7 x64 there's no need to use this patch.
Please note this patch will not produce mismatches on online sessions. We've been using it during internal testing without problems on that matter.
Just in the case you think it's: no, it'll not crack rFactor
Note: Any problems or issues derived from its use is responsibility solely of the user."
Not sure where else the patch is available, but I can email it if you wan't, it's only 44k
Cheers....
(Edit) P.S. I should mention that my rFactor wasn't crashing before I aplied the patch to it's .exe but there arn't any side effects either
and it seems to be loading faster too (game & tracks)