Perfect Lock

Security of simple folders is pretty difficult to enforce by default, even though Windows lets you hide them. However, developers thought of various methods and came out with specialized applications just like Perfect Lock in order to put a lock on virtual drives in which you can store just about anything.

Perks of portability

A cool advantage comes in the form of portability, allowing you to check out the application's set of features as soon as download is done. As such, it's easy to store on a USB flash drive in case you want to use it on other computers. No traces are left on the target PC, because system registry entries don't need to be modified to ensure functionality.
The first step to the operation si to set up a master password. There's no strength indicator or built-in generator to help out. Confirmation is required to make it work. Don't worry if your first attempt isn't strong enough because you can change the master password from the settings menu at any given moment.

Drive hides when not used

The application works by creating a virtual storage device. Your computer acknowledges it as a fixed disk, with the X drive letter set by default, and no option to change it, or the name tag. You can't configure available space either, but the application uses the system partition for space, so all available space there can be used in the virtual drive.
With the password configured you can easily access the new drive by simply punching in the security code. The drive immediately opens up, and remains visible as long as the application is running. If you want to quickly launch the application from any location, you can assign a hotkey command to its shortcut from the Properties panel.

To sum it up

Bottom line is that it's best to stay on the safe side especially when multiple individuals use the same computer or have easy access to the same account. Perfect Lock comes as a reliable tool in this regard, with a straightforward approach, and difficult method of being tracked since you can store it on a thumb drive, and the virtual drive is almost always hidden.