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WOW that worked perfectly for my situation
I upgraded from XP home to XP pro.(no this does not require a reinstall of windows XP there is a utility that will do it) in the process a few programs got hit pritty hard including my APC UPS detector and daemon tools.
I had the same symptoms listed above plus a few more. if I inserted any USB mass storage device it would apear under device manager however a drive letter would not be assigned to it. if I then loged out of that account and loged back in I would then see the usb device on the assigend drive leter. I could use it as a normal device however this was a pain and would break promptly after being removed (it would also not free up the drive letter till reboot.) I was also able to access the device throu device manager by tight clicking and the clicking open.(this was not 100%) I stumbled onto this web site and ran the command line and POOF... it all works again. a mighty simple fix for what seemed to be a larger problem.
Thank you, you are my hero for the day
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