Best advice is to open Bootcamp Assistant under Utilities, print the directions and follow that. You will need an unused, unactivated copy of Windows and not a disc supplied with another computer, such as Dell etc.
You will also need your Snow Leopard install disc to install Windows drivers. Also when installed download Bootcamp version 3.1 and 3.2 and install whilst in Windows. remember you will need antivirus on the partition, Microsoft Secuirty Essdentials is free and good.
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