As many will know, protecting files on removable storage media using a password and encryption it's too simple in the Windows 7, without requiring an external application.
This is because among its functionalities we find the tool BitLocker to Go, which allows to protect USB sticks immediately.
To do this, obviously, we must first plug the memory into the USB port corresponding, with the appropriate drivers previously installed.
Then we must press the right mouse button on the chosen unit, selecting the option from the drop-down menu Turn On BitLocker (as we see in the photograph)
From this the Graphic interface of the application will guide us step by step, being able to select add a password, with two password fields (one to assign it, and another to repeat it in case we misspell it)
Once this is done, we will be obliged to create a file with the key, or print it, to avoid future headaches (we cannot avoid this step)
Then we will be offered the storage drive encryption, for which the application will do it automatically (and to give us an idea, on a 1 Terabyte disk the operation time is 12 hours)