Freecom xxs external hard drive not detected

Hello,

I recently purchased a Freecom xxs 320GB external hard drive.

When I connect it to my laptop (Windows XP SP2), it is detected properly.
However, when I connect it to the desktop PC (also Windows XP SP2), it is not detected. It doesn't appear in My Computer or Disk Management.

At first, I thought it was a USB problem. The PC had USB 1. I just added a PCI USB 2 card to the PC, but the drive is still not detected.

I'm not sure what to do next.

Here is the diagnostic of my PC

Thank you for your responses

--------[ Summary ]------------------------------------------------------------------------------------------------------

Computer:
System type ACPI Uniprocessor PC
Operating system Microsoft Windows XP Home Edition
System service pack [ TRIAL VERSION ]
Internet Explorer 6.0.2900.2180 (IE 6.0 SP2)
DirectX 4.09.00.0904 (DirectX 9.0c)
System name GD
User name Christophe
Domain [ TRIAL VERSION ]
Date / Time 2009-01-01 / 16:05

Motherboard:
Processor type AMD Sempron, 1666 MHz (10 x 167) 2400+
Motherboard name ASRock K7S41GX (2 PCI, 1 AGP, 1 AMR, 2 DDR DIMM, Audio, Video, LAN)
Motherboard chipset SiS 741GX
System memory [ TRIAL VERSION ]
DIMM1: TakeMS BD256TEC400 256 Mo PC3200 DDR SDRAM (2.5-3-3-8 @ 200 MHz)
DIMM2: Corsair Value Select VS512MB333 [ TRIAL VERSION ]
BIOS type AMI (10/28/04)
Communication port Communication port (COM1)
Communication port Printer port ECP (LPT1)

Monitor:
Video card SiS 741 (64 Mo)
3D accelerator SiS 330 Mirage IGP
Monitor Plug-and-Play screen [NoDB] (F6HJ510134175)

Multimedia:
Audio card C-Media CMI9739A/9761 @ SiS 7012 Audio Device

Storage:
IDE controller SiS PCI IDE controller
Floppy drive Floppy drive
Hard disk WDC WD800BB-00JHC0 (74 Go, IDE)
Optical drive _NEC DVD_RW ND-3520AW (DVD+R9:4x, DVD-R9:4x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-ROM:16x, CD:48x/24x/48x DVD+RW/DVD-RW)
Hard disk status SMART OK

Partitions:
C: (NTFS) [ TRIAL VERSION ]
D: (NTFS) 51309 Mo (22712 Mo free)
Total size [ TRIAL VERSION ]

Input:
Keyboard Standard 101/102 keys or Microsoft Natural PS/2 Keyboard
Mouse Microsoft PS/2 Mouse

Network:
Main IP address [ TRIAL VERSION ]
Main MAC address 00-0B-6A-C6-BC-8D
Network card PCI Fast Ethernet SiS 900
WAN network card (PPP/SLIP) Interface (79.8 [ TRIAL VERSION ])

Devices:
Printer hp deskjet 840c series
Infrared controller Infrared port
USB1 controller NEC uPD720101 USB OpenHCI Controller
USB1 controller NEC uPD720101 USB OpenHCI Controller
USB1 controller SiS 7001 PCI-USB Open Host Controller
USB1 controller SiS 7001 PCI-USB Open Host Controller
USB2 controller NEC uPD720101 USB 2.0 Enhanced Host Controller (v1.0)
USB2 controller SiS 7002 USB 2.0 Enhanced Host Controller
USB device USB Print Support
USB device USB ADSL WAN Adapter

DMI:
BIOS vendor American Megatrends Inc.
BIOS version P2.00
System manufacturer American Megatrends Inc.
System name K7S41GX
System version 1.0
System serial number [ TRIAL VERSION ]
Motherboard manufacturer
Motherboard name K7S41GX
Motherboard version 1.0
Motherboard serial number [ TRIAL VERSION ]
Chassis manufacturer Unknown Chassis Manufacturer
Chassis version Version 1.00
Chassis serial number [ TRIAL VERSION ]
Chassis identifier [ TRIAL VERSION ]
Chassis type Desktop Case
Memory sockets (Total/Free) 3 / 1

Configuration: Windows XP Internet Explorer 6.0