help!!!

[Silverthorn]

well, I suspect your computer to be a pretty slow one...
try to re-install the mod, and if it still won't work, you'll have to aggressively mess around in order to make it work (which could take either a lot of time or knowledge. or both).
It might also help to disable some services from your computer but I don't guarantee that your computer would run stable then. This is just the very very last option available.

But, like already said, it may be that your computer is just too slow, I had LF4t on my computer, too, a few years ago, and it worked without any problems, and my computer was really good at that time...