How can I activate my server OS after the time limit for activation has been expired?

I recently installed windows server 2003 enterprise edition, evaluation version on a pantium III machin and I forgot to activate the product within14 days time limit for activation. Now I can´t log on and instead I am directed to a dialog box for acivating the product. But when I enter the product key as I am asked, It says that the product key is invalid and give me the option to visit Microsoft website for more infomation which I couldn´t find proper solution. Any good advise is highly appreciated. Nader
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Alan Huseyin KayahanConnect With a Mentor Commented:
  It shouldnt ask you the product key. What you are asked is the activation, which you can either complete via internet or by phone. If it says tat your product key is invalid, you should contact your vendor which you purchased your license from

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