Connecting 3 computers Windows XP

I have 3 computers One in the living roon one in the office and one laptop. I’m using XP Pro on all 3. Right now I’m able to access the internet on all 3 but I als want to be able to share and transfer files and folders b/n the 3. I tried using the Home network wizard with my office computer and all it did was add a folder to my network places that contains all the things I would like to share. How do I access this folder from the other 2 computers?