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Unfortunately, it is beginning to sound like either of two problems. Neither one good. You might have had a virus or rootkit installed on your system without your knowledge or your usb host controller or motherboard itself might be going bad. Then again you might just have a bad reader. One last question though. I now you said you have not done any upgrading but which service pack are you running with XP? There have been many problems with usb ports on some systems after they were upgraded to service pack three. It just occurred to me that that might be causing your problem. Also some software installs can do the same thing. Just throwing out another idea or two here.
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