Why am I not getting an IP Address?

I recently discovered that I lost my network connection between my Win 7 and Win XP sp3 machine. I didn’t take it seriously because I never had good connection eversince I upgraded one of my machine to Win7. I decided to investigate the XP machine, typed ipconfig /all and the IP Address and Subnet Mask showed all 0’s, and Default Gateway was blank. Does this mean that my network card on the XP machine is dead? If not, what other tests can I perform to verify if the card is ok? I am using a D-Link DI 604 cable router between mahines.

I appreciate your help.
Thanks,
Deacq