I know this should be an easy fix but i don't know what it wrong. I recently set up time machine on sl and then when i rebooted it, it said can't find mach_kernel. I tried replacing the mach_kernel through windows 7 through transmac.Please help.!!

Specs;
SL + win7
Hp pavilion a6109n
nforce 430 mobo
8600gt
30gb hd
2 gb memory