my laptop has a broadband connection which i want to share on my Sony ericsson p1i thru wifi. i tried ICS.help

[bluechaos]

i'm able to connect in ad hoc mode from my pda to my laptop.i'm not able to access internet on PDA even after enabling ICS on my ethernet adapter on laptop. both the adapters are set for DHCP enabled. I'm running windows vista home premium and PDA:Sony ericsson P1i