XP pro missing services.

Hi,
Dual boot PC (Linux, XP pro). Cannot access internet via XP. Nor can launch system restore or Help & Support. No problems under Linux.
IP address showing as null.Releasing it reurns ‘already released’. Trying to renew gives error message re RCP server unavailable.
Checking services I cannot find DHCP & DNS. Is there any way I can reload them ? Any ideas as to how this happened ? Scans don’t show any viruses/malware.
Thanks for any contributions.