You mean completely erase windows and replace with Linux, or set up a dual boot? In either case, almost any distribution can do that. Go to www.distrowatch.com
to read up on options. Good <free> choices for beginners include Mandrake, Fedora, Knoppix, Morphix, or Mepis. All include partitioning programs that allow you to create/erase partitions. Alternatively, you can get partitioning software separately like partition expert from www.acronis.com.