PC will not recognise Lacie Rugged 250gb drive

Bought this new drive and plugged into my firewire - did not even recognise it! I thought there was something wrong with my firewire so tried another device on it with no problems.
I then tried using the USB. My computer recognised that there was new hardware and even stated that I could start using my new hardware. However, if you look into My Computer and Disk Management, there is no drive. However, I can safely remove it as I have the Safely Remove Hardware icon on my taskbar. Double click it and the Lacie drive shows up.
How can I get my system to recognise my new product? I bought this from Amazon so unless I can get it to work, I will have to send it back. Can anyone help? Thanks.