It could be that XP doesn't like your card reader. You can go through
the Microsoft configs here for Usb;
'General USB troubleshooting in Windows XP' (http://tinyurl.com/io1e)
Other than that, try some different media and see if you have the
problem across the board.
Best,
Treeman
Have you contacted the manufacturer? Sometimes there are solutions in the
FAQs. I am having the same problems and the mfg is working on it. Just
waiting for a solution. Had problem few months ago, had to do a registry edit
and all was fine until the other day - can't remember the edits. So going
through the whole tech support thing again.