click start control panel administrative tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark? ! or a red X

you will need to update/reinstall drivers

right click to reinstall drivers

if you can see your usb drive but its not working

ports (com&lpt) right click update driver if this fails to fix the problem

check the USB leads that attach to the motherboard usually red white green black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems for a computer and its parts

if you are referring to a corrupted usb drive

click start control panel administrative tools computer management disk management right click on your drive select properties click tools you should see click check now click start two boxes

automatically fix files and scan for and attempt recovery of bad sectors place then a tick in both boxes then select check now start

you might tick one box then return after its finished the first repair then return and tick the second box you should not do anything while the chkdsk utility is in progress any input may damage this drive

I found that you get best results by ticking one box then returning after it has finished then tick the other box

If you need more help with this post a reply

hope this helps you