My sandisk usb flash drive does not show up as a drive in a Dell 
Optiplex GX280 w/ winXP pro.  The same flash drive shows up in 
numerous other Dell, IBM and HP computers, just 'plug and play'. 
Same drivers show up on all the computers, 2 entries in device 
manager - one under disk drives and one under storage 
volumes\generic volumes.  Everything appears to be exactly the 
same, everything working properly, except it doesn't show up in 
windows explorer as a removable drive or anything else.   Doesn't 
matter which usb port I plug into, doesn't work.    Other than a 
mouse, none of the usb ports are being used.  Any ideas?

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