To replace a Microsoft product key, you must contact Microsoft Customer Service and Support. To locate the appropriate telephone number, visit the following Microsoft Web site:
Note When you contact Microsoft Customer Service and Support for a replacement product key, you may have to pay a fee. You may also have to provide information from your computer or from the product CD or DVD when you are speaking to the customer service representative.
If you've still got it installed on your machine, you can reveal your XP key. There are a number of programs to do this, but doing a quick search I found this:
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There are some solution here http://www.petri.co.il/recover_lost_product_keys_f...
Also, from MS
How to obtain a replacement product key
To replace a Microsoft product key, you must contact Microsoft Customer Service and Support. To locate the appropriate telephone number, visit the following Microsoft Web site:
http://support.microsoft.com/default.aspx?scid=fh;... (http://support.microsoft.com/default.aspx?scid=fh;...
Note When you contact Microsoft Customer Service and Support for a replacement product key, you may have to pay a fee. You may also have to provide information from your computer or from the product CD or DVD when you are speaking to the customer service representative.
I've heard the fee is $10
If you've still got it installed on your machine, you can reveal your XP key. There are a number of programs to do this, but doing a quick search I found this:
http://magicaljellybean.com/keyfinder/
It's possible that the CD Key is on the case of your PC.
Otherwise, you're screwed!