Please insert disk?

I insert my USB stick and it said:Please insert a disk into Removable Disk (E:).My stick is a 1GB Maxell and the problem was made by the stick in the computer and my friend walked by and it got pulled out of the drive and the plastic shell was ripped off,the actuall USB part was perfectly ok,i just pluged it in and:Please insert a disk into Removable Disk (E:).Please help!

Thanks