Product Key is not working for Office Trial

It is my new desktop running with Windows XP and Office 2003 Trail. Whenever I open any Office product it prompts me with a message asking for entering product key. Whenever I enter the product key, it says Invalid Product key and quits. I am sure am entering the correct product key and for instance it is the same key written on the back of my system on the Certificate of Authenticity. I tried with all office application and still getting the same problem.

Also let me tell you that I dint received any Office CD hence this is the only one product key I have with me as of now. Can someone please help me out activating my Trail version ?

Well buddy it was obvious that those keys dint worked for you, neither they will work In future. The reason is very simple, those are the Windows Product key and not for your Office. You should have got any documentation with the system. Check the same for Office keys. If it is not there you should call up your vendor and ask for the same. They will help you activating it for 60 days Trail.

Aman! My product key does not work either.