doom: you
have to check how your router was setup to issue ip addresses. the
DNS for your computer and laptop should be pointing to your router.
and from there, the router will query the real DNS server from your
ISP.
goofy: i
assume you have a router between PC and ISP cable modem. if your
sister laptop works fine, i suggest you compare the 2 network
connections - your sis and yours - if it is the usual type of
config it should be: