Problems After Installing 10.5.6

[KaMii]

Hey,

I hope you will help me out if this problem.

The problem is that i was using iAtkos v5i perfectly fine... then i saw an update to 10.5.6 in software update... and without knowing anything just updated it... i though it will work fine...so silly!!

then, i came to know that i have to have a pcefi bootloader or chameleon with dsdt support...but i had neither of them

i had my mac os setup perfectly and i have been using this from months now and i cant afford to lose this...

please tell me a way to boot back....
what happens is at darwin bootloader...it count downs from 5 to zero and then says "Loading Darwin" for a fraction of a second and suddenly my pc restarts...