Lacie 1Tb USB HDD not recognized, even in Disc Utility

Hi to all,
I have just bought a Lacie 1Tb external USB disk. It did not work correctly under Mac OS X but it works when I use it under Parallels. It is formatted as NTFS and I manage to use correctly under OS X my old Lacie 250 Gb (also NTFS). When I connect the drive to my MacBook Pro nothing happens or sometimes a folder appears on my desktop (with the content of the HDD, read only) and in Finder the HDD is mounted with an icon with a W on it (not the usual orange icon with usb symbol). I cannot use the HDD. If I open Disc Utility the HDD is not shown at all but it appears correctly under System Profile. If I boot with the installation DVD and the USB attached, Disc Utility (launched from the DVD) sees correctly the drive. My conclusion is that there is some software that conflict with Mac OS X in mounting the device. Someone of you has any clue to provide? Is there a way to "reset" the way MAC OS X handles NTFS partitions (if it is a problem with NTFS)? The USB disk works correctly on another Mac with OS X (I tried it at the shop).
Thank you in advance for your help and I wish you all a Happy New Year.

Thank you for your reply.
At the moment also the other HDD has the same behaviour. It looks like I screwed up the usual NTFS OS X handling What I did was to uninstall Mac Fuse completely (by disabling it and then by removing the icon from System Preferences, as described in the Mac Fuse help page). I had no need to install drivers to make the "old" HDD to work (when it worked . Also when I tested the 1TB HDD on a Mac at the shop, the Mac came with a clean standard install. The worst thing is that Disc Utility completely ignores the HDD presence so I cannot even initialize it. As I said I could initialize it booting with installation DVD but I would like to fix the issue. I removed Mac Fuse I had installed to try to reset the things... with no success I think that, even without any external software to read/write NTFS partitions, I should be able to mount the drive or at least work with it under Disk Utility, shouldn't I?

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