Clicking the lock does not work HELP

Question

clicking the lock at any kind of program does not work at all, not working in system pref,
not working at ''get info'' window, not working in any other kind of lock, i tried defragging via idefrag but that couldn't work because it needed a lock to be opened as well, i can't move my files to some folders, getting the ''The operation can’t be completed because an unexpected error occurred (error code 100022).''
plus when i log out, cannot log in because when i type my password it accepts it but then nothing happens, i had a root account as well but i can't enter it and can't create again because of the lock, but when i log in with guest account(no pass required) i can make changes via clicking the lock and filling in admin username and password in system preferences. and i created a new admin account in guest account by filling admin info for authorization in system preferences > users&groups , set no password, logged out but could not log into that account as well. my system is set to login to my account when the system starts. so thats how i can use the computer

Answer 1

Back up all data if you haven’t already done so. There are ways to back up, even if you can’t log in. Before proceeding, you must be sure you can restore everything to the state it’s in now. If you’re not sure you can do that, STOP.
Briefly, you need to delete the following file:
/var/audit/current
If you already know how to do that, you can skip the rest of this message. Do it, and try again to log in.
Step 1
Boot in single-user mode by holding down the key combination command-S at the startup chime. If you’re using an external USB keyboard, it must be plugged directly into a built-in port on the Mac, not into a hub. Release the keys when you see a black screen with scrolling white text. In this mode, there’s no graphical interface; just a command line. Initially, you can’t make any changes to files.
Step 2
When the text stops scrolling, and you see a line ending in a pound sign (“#”), type the following command:
rm /var/audit/current
You must type the command exactly as given. If you don’t feel able to do that, STOP. At this stage, no harm will be done if you make a mistake, but later, it will be.
Press the return key. You’ll get an error message about a “read-only filesystem” below what you entered. There must be no other error message. If there is, try again until you get it right. You’ll continue to get the read-only error.
You might get the error “No such file or directory,” even if you entered the command correctly. If you’re sure that’s the case, stop and post again.
Step 3
Once you’ve taken steps 2, and received the expected error messages, enter the following command:
mount -uw /
Again, you must get it exactly right. This time, there should be no output at all. If there is, you mistyped the command, or something else is wrong.
Step 4
When you’ve taken step 3 with no error message, press the up-arrow key until the command from step 2 (rm …) reappears. If you got everything right on the first try, you’ll need to press the key twice. Make sure the command is correct, then press return again. There should be no output. If there is any, make a note of it and post a reply.
Step 5
Enter the command:
exit
Press return. The text will start scrolling again, and then the system will reboot. Try again to log in.
Credit for this solution is due to ASC user AnthonyTW.