i'm going to be installing mandrake 8.1 today, and I'm wondering two things: first, how do i make sure i'm not deleting any of my current windows files when i set the partitions, and second, about how much room will i need for linux? I've got about 4 gigs free currently on a 10 gig hard drive (yes i know its old, i'm supposed to get a 75 gb 7200 rpm drive soon anyways)

thanks for your help, and sorry for the dumb questions, its my first time installing linux