HDD box thing. (Sorry, not good with this kinda thing)

[Muscatt]

Hi, I've got a 160GB internal hard-drive and I thought it would be alot easier to buy a box that it could attach to making it external. (I think the make is i-buddie) I attached it up, connected it to the computer and the computer won't recognise it. I'm running XP, so a little balloon comes up saying "new device attached", it sees it's atteched, says "unknown device. Then it claims it's malfunctioned. And then nothing. I can't find it anywhere or get it to work! The HDD is fresh out of the box, It's not been formated or anything (mainly because I have no idea how) Any help would be great. Thanks.