Can't recognize external hard drive

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Hello, I have a 1TB external Hard drive by Maxtor. I used it on a mac computer for a while, and have a lot of data on it, now I have switched to a Windows XP operating system. However the computer won't recognize the hard drive. I tried it on my laptop and it works fine I can access the files(lap top is also a windows XP system) but not on desktop computer. I never had to install any drivers on the lap top for it to work, so I don't know if that would be the reason it doesn't work on the desktop computer. It is connected through a USB 2 port.  I have gone to device manager and it does not recognize the hard drive. Would anyone have a suggestion as to what I should try and do to get my computer to recognize my hard drive? Any help is appreciated, thx in advance.
-cLiP

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You realise MAC and Windows use 2 different file systems ? ?

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Yes, but I was able to access the files on my lap top despite that

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Right clik My Computer with it hooked up to the desktop and select Manage...then Disk Management...
Right clik the drive and select Properties.
Report back with your findings...

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It gives me an error.
Logical Disk Manager: The dependency service or group failed to start
...any ideas??