Since it is shared on the network, is it probable that the thing is locked as a network resource and considered in use by windows? It might be worth a try to remove it as a network resource before trying to access it locally. I'm grabbing at straws, but you never know when you will draw the long one.
Well funnulee enough, one of the more obscure messages in one of the may variations of trying to resolve it, was that it did say "this doo dah is being used by another program, quit the other program and try again" - but there was nothing (folders, programs etc) actually linked to it and running it or anything in it.
And in amongst some satanic possessions of myself and the PC, (Who???) I did make some more super tight arsed restrictions in access and use - partly cause I was setting the machine up for the largely computer illiterate girl friend who I did not want to hear say "Oooo was that bad?" and partly to keep the meesianic leigons of doomful prophecy at bay.
Hmmmmmmmmmmmmmmmmmmmmmmmmmm
Was it in Admin settings, MS firewall, Outpost, Spybot.... Ummmmmm
Any ideas on how altering network access settings could "lock out / in use" a flash drive? Where do you feel would be a good place to check and what do you think I should be altering or attending too?