Problem: opening a USB memory

Hi! I have a little problem with my usb memory. It was inffected the last last week with a trojan and although Its clean now (or norton systemworks say it) When I tried to open it from MyPC, you know simply double-clicking the unit icon, windows launch me a window telling me with what program do I want to open the “file”; its not even recognizing like a unit, or its missing a hardware property. I suppose that s*th damaged something like an ini file of the memory, and to open it I must right click and select open or explore, thats not a problem at all, but I like my things working as they suppose to. So I want to know if you have a solution for this issue. Thanks for any thing.