Thanks for your prompt help. I considered calling but thought it might be unpractical to run around around the house figuring out different things about 4 computers on the phone. So your patience with me is much appreciated. Three of the computers are XP including the problem laptops and main/routered desktop and my husband has Vista on his new laptop. All have set/assigned non-varying IP addresses. Following the link you provided, three show up on the reserved "DHCP" table, though with expired dates from August before we even bought the router or laptops. One of the problem laptops using the Linksys adapter does not show up at all. I figured out the MAC address to that one - should I add it? And should all have the "Enable DHCP" box checked or unchecked. Thank you, Robyn