make my local network

[POISON]

Hi all ..

I have a laptop has a Vista Home on it ... and a desktop with XP ... both PCs are connected to a router ...
I need ur help for transfering many files from my desktop to the laptop ... espesially that I do NOT have any experince on Vista ... so , I guess I need to make a netowrk and file sharing but I have NO idea how ! .. please help this is urgent