How Can I Find My Activation Key?

I removed my Windows Vista from my notebook (Acer Aspire 5610) and install
Windows XP.
Now i want to install Windows Vista again but i can't find my activation key.
Activation key is not written on my Windows Vista box.
So where can i find the activation key?

Most computer manufacturers put the Vista key on the computer on a sticker.
You may also find it in the documentation that came with your computer.

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"Volkan" <> wrote in message
news:C163C65B-4293-4531-824A-...
>I removed my Windows Vista from my notebook (Acer Aspire 5610) and install
> Windows XP.
> Now i want to install Windows Vista again but i can't find my activation
> key.
> Activation key is not written on my Windows Vista box.
> So where can i find the activation key?