Failure installing Windows Vista Business on laptop via USB port

I was installing Windows Vista Business Edition on my laptop. I had to do it via USB port as there is no DVD drive in my laptop. But when I clicked the ‘Activate Windows Link, a message popped up reading ‘The key is invalid for activation’. After that I was given a choice to change the key or purchase another one. As I tried later with the same key I used before the failure message appeared again reading ‘Error Code 0xc004e003’ (Please check the attachment for details).” Do I need to buy another key or I have some other way to solve the problem. Your help will save me from a lot of trouble.
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