The reason it cannot see it on your XP computer is that the file system is Fat32 not NTFS. To check, double click My Computer right Click C:\ Properties You can convert your XP file system to NTFS and would not then need any Extra Hardware
Also If the Card is Left in the Camera, and Camera Plugged into PC it will then see it. all extra hardware needs room and have to be looked for when needed if you are like me I cannot shift for cables and hardware that plugs in, and need finding and sorting as what fits what
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