local session manager failed to start so im locked out!

ok let me see just how to explain this. basically i need to know how to start
the LSM somehow between bootup and before login.
how did it get disabled? because of a careless mistake i made in my firewall
zone alarm, which has been no help btw. i dont think they even know their own
product.
someone please help. as soon as i hit enter to login the message

LSM failed to start. access is denied.

this is my main hd and need back in.
i tried running the vista disk but it will only allow my to freshly install
a copy, it doesnt read any backup to restore points for some reason, nor does
it even catch on that there IS a startup error.

please dont tell me im out of luck,cause im !@$%ed.
--
"The object in life is not to be on the side of the majority,
but to be insane in such a useful way that they can''t commit you"