I have a problem getting my windows xp media center edition 2k5 to validate my product key.

 

It was just fine when I bought the computer (a Dell E510), then I reformatted the computer completely yesterday and now the product key that is stickered to the top of my Dell machine will not validate. I double checked the number and retried multiple times with no success.

 

Please help me find an answer to this problem.

 

Thank you,

David Crivac