New Rule: If within a four line paragraph your only punctuation is three periods at the end, and it is not written like that for artistic literary effect, you don't get help.

Seriously, less panic, more calm-the-frak-down. Then, A: Did you reboot yet? Reboot. Still have the problem? Do you have rootsh installed? Install it because you might as well have it. Then, open X-Terminal (Ctrl+Shift+X if you hid that too). Enter Tell us the output. Or, if you want to go straight ahead with it, become root, and then enter That's a lower-case L in the dpkg -l code, and applocker might be app-locker or app_locker or something. I don't know the actual package name, and am too lazy to look.