When you work on a shared PC, it is really easy for another user to access the data you have stored on the hard drive. If you store important information there, you should use a tool like Locker, a tool which password-protects them.
Protect your files and folders so no-one can access them without your consent, as they need the key with which the files were encrypted. With Locker you can protect files, folders, hard drive sections and even disc drives. This way you`ll be sure that no-one can use, for example, the CD-Rom drive in your PC.
And if you want to block almost the whole PC, so no-one can access anything, with Locker you can do it. It lets you block the Windows desktop folder, disabling all the files, folders and shortcuts on it.
NOTE: It is important to realize that by using Locker you password-protect your files. Without that password you`ll not be able to access them again.