Lost Disc and Key

[armandchi]

Hi,

I've lost my disc and key but urgently needed a reinstall of windows. I
wrote down the product ID which I thought would help me, and installed vista
(premium) from another disc. However, I have no key and so I now have no way
of activating it even though I possess a valid product ID.

Is there anything I can do or have I just got to spend money on another copy
of Vista?

Thanks.