You've seen the problem that your USB is not detected on your PC is not to damage your USB using the "Safely Remove adware.

Well, here I leave the LFF2.36 a program that repairs of your USB problems ... What makes this program is to format your USB low, so that Windows can detect when re-connect.

http://rapidshare.com/files/257477491/Reparar_tu_USb.rar