Longshot. Try this:
1. Start LFS ( here it will be in windowed mode ).
2. Shift-F4 to make it fullscreen.
3. CTRL-ALT-DEL.
4. repeat step 1. to 3. as many times as you want to.
5. Shift-F4 to, one by one, get the games back into windowed mode.
Not sure it will help you issue here but this is the only way to even be able to start LFS more then twice with my PC or, without step 2, I´ll be stuck with a black LFS game, using 100% CPU.
The formation lap of yesterdays IGCT race I´m able to with 10-25 FPS with 3xLFS, CPU load, my limiting factor, is just under 100%, P4M 2.2 Ghz, No AA/AF -Res. 2148x1150 - GF6800. XP.