Are you worried about other access to your computer when you are out? If yes, why don't you choose Security Administrator 12.04? This is a really great solution for you in this case

Major features

1. You can restrict access to your PC with Security Administrator.
2. This password-protected security utility enables you to impose a variety of access restrictions to protect your privacy and stop others from tampering with your desktop.
3. You can deny access to each individual component of several Control Panel applets, including Display, Network, Passwords, etc.
4. You can disable your boot keys, context menus, DOS windows, Registry editing, and network access. Hide your desktop icons, local, network and USB drives, Start menu items, or even the entire taskbar.
5. You can also apply password protection to Windows and restrict users to running specific applications only, control Internet usage, view statistics of working of your kids or employees.
6. Security restrictions can be applied universally or to specific users.
7. You'll find the program interface very easy to negotiate.
8. Excellent documentation is available.

Improvements of this version:

1. Now fully compatible with Windows Vista;
2. Obsolete restrictions were removed;
3. Over 50 new Vista restrictions were added.
4. Help system was rewritten.

Requirements: n/a