I can't connect to the Internet

my moms computer had vista on it an it crashed, so i installed xp pro and now the internet wont connect. in cmd prompt it says that the media is disconnected but everything is fine becuz both of my wireless laptops r connected fine...ive already tried to repair the local ac an it didnt do anything. also have tried reassigning the ip address and unplugging/ restarting the modem. help
 
Sounds like drivers issue. Can you put Windows 7 on it? What type of CPU and how much RAM you have?
 
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