What should I do if the win7 search text box is missing?

When we use the computer, we often don't know when it caused the error of our computer. Sometimes we accidentally or mistakenly caused the search text box in the start menu of our win7 Ultimate computer system to disappear. It is very inconvenient for us to use it sometimes. How can we solve this problem?
Resume search text box operation method:
1, first open the start menu, see the control panel inside open it, it will pop up the control panel window, and then see the program and function inside the icon selected to open, Then select the option to "turn Windows features on or off" in the upper left corner and wait for the new window to pop up.

2, the newly opened window "Windows Features" option found in the "Windows Search" box this option, then the next step.

3, after select Settings and click OK, and then being open to change function [Hint] window, waiting to re-open windows.

4, in the pop-up window, select "Restart Now" computer, and then it will start to set before us, and we see whether the search box has come back.