Expired activation

I had to replace my hard drive. When I reloaded Windows XP Pro I was asked to
activate, which I didn't do at that time. I lost my Internet connection and
sound at the same time. I restored my sound but not the Internet connection.
I did a phone activation and I thought it went thru. I was not on the
computer for several days. When I got on I had a message to activate. I did
the phone activation and was told DO NO RECOGNIZE THIS AS A VALID PRODUCT &
UNABLE TO PROCESS ACTIVATION. My computer is useless. What Can I do? PLEASE
HELP!!!!!
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