Connecting to xbox live with through a laptop

I HAVE A:

SONY VAIO LAPTOP WITH VISTA(I KNOW ITS VISTA)
XBOX 360 ARCADE(WOW AT THIS RATE IM SCREWED)
20GB HDD HARD DRIVE FOR MY ARCADE(IM SCREWED)
AN ETHERNET CABLE

now to my understanding there is a way to get my xbox hooked up to live if i put the cable into my laptop and computer

but ive seen many many vids saying this can be done(ive seen it done)

but there is a lot of different methods

can someone please give me a step by step(plz) post telling me the best way to get xbox live with this

and yes i know i need the monthly or yearly subscription
but if i understand correctly the first month is free( i hope)

someone plz help me out

i will give you a cookie!
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