True that WIN7 is critical, yesterday my laptop got black screen and wasn't able to turn it on anymore, reinstalled windows now it is working somehow.
The problem was that hard disk got confused and got messed up.
That's called VOB modding and it is not allowed here.
EDIT: JOOS means you are having problems with LFS which means you modified or tweaked it.
Reinstall LFS and don't use VOB mods again and you won't have problems.