Title Bar Buttons, Terminal are disappeared

Hello dudes,

I started my laptop normally and I was bothered that the title bar and it's buttons are disappeared, I've tried to reboot several times but it's still the same. Then I've made a search on google about the issue and some site mentioned that I have to make this command :

compiz --replace

Then I pressed CTRL ALT T to access the terminal , but it did not appear I thought its a lag issue. Then I went to the menu to access it. but it wasn't there . And I don't know what is missing too when I need it .

Please I need your help.