Registering my copy of Windows XP

Is it possible to register my copy of Windows XP Professional?

When installing it, I had to use the telephone to activate. This meant I couldn't activate and register over the internet, as offered during installation.

I've hunted as best I can through MS's information website but can't find the answer.

To sum up: my Windows XP is installed and activated. Is it still possible to register it, please?

Thanks for looking...

 

Steve: thank you very much.

All went well until the information was to be sent over the internet. Then, a screen came up and said something along the lines of: "Sorry! Windows Register Wizard has encountered a problem. Would you like to send the error details to Microsoft? "

Bill Gates has a sense of humour!