Just curious, go to Start - Run, type in cmd and OK. At the command prompt, type in ipconfig & <enter> - do you get anything - if so - please paste information and make sure to let us know if it is from the good computer / bas computer (best if you paste both)

if you do not get much on the bad computer, type in ipconfig /release & <enter> and then type in ipconfig /renew & <enter>