Can you tell me if. Can you tell me if a Linksys Router will work withWindows 2000(Millenium) - XP

Question

Can you tell me if a Linksys Router will work withWindows 2000(Millenium) - XP or Vista.I have a Linksys Router Model # WRT54G.My friend also has a Linksys Router (I dont know model # of that one. He is trying to use it with a 2000 (Millenium Windows )& and an XP computer. & is having trouble.
Does it work for Laptops & desktops.