All computers unable to see the Flash drive

Hello,

I need a bit of help, please. Yesterday, as I was in hurry and wanted to copy something quickly, I chose a folder and pressed "Copy" in Total Commander (in Win XP). An alert popped up, something like "a folder does not exist / can't be read" and there were some options under it, so I clicked "as an administrator" (cause I thought it has to do something with rights, that the flash drive is unable to cooperate).

It wanted to me to add a name of the user, so I stayed with "Administrator" and when it wanted a password... I left it empty and pressed enter. Unfortunately I can't remember what it wrote afterwards, but it couldn't see the Flash drive anymore. As I was trying to put the Flash drive somewhere else, other computers can't detect the driver either.

Please help :(

In Win 8, where I am using it now, it seems that the "Settings" screen can see the device, but that's the only place where I can see it. Plus it's a place, where I can't do anything with that except removing the device.

BTW When I connect it or remove, the Windows sound appear. It just doesn't add an option of e.g. F:\ or something like that.