This is what i would try:
Firstly i would try it a few times to see if it just starts to work
If that didnt work i would do a diskdefrag just to test if your computer isnt messed up.(By doing tht you do Start>All programs>accessories>System tools>Disk Defragment).
Also maybe your spec of your pc cant cope with Windows Vista and LFS?
(CPU or Ram)
Not saying these wont work but might aswell try putting more ram in depending on how much you already have
Good Luck