PC detects the pendrive but pendrive does not respond

Hey Guys,

Here is the problem - I have 4gb pen-drive. Im using windows 7. When I connect my pendrive it shows the size bar(which shows free space out of total GBs) in my computer. when I open it, pc shows it as a blank pen drive while the address bar at the top shows the opening in progress status. some times my window hangs. and sometimes it doesnt even show the size bar in my computer. it shows just a name of the pendrive without its size bar.

Nothing happens if I try this command in cmd --> attrib -h -r -s /s /d g:\*.*

When I try to access it through device manager it only shows 'connecting to virtual device' message.

I dont want to format this pendrive as it has very crucial data in it. I have to get this data. please assist.

Thanks,
Sinz