There are several sources of Windows7 controls, like traditional desktop application development or Web development, with default-provided controls and Third-party controls published by third parties. In general, using the default control is sufficient if it is not an overly complex interface layout.
Below, let's take a look at how to retrieve the missing files under the Win7 system.
1. First, click the computer on the desktop, eject the computer box, select the central System Properties option, and then click the left System Protection option.
2, select you want to turn on the protection of the disk, you can open all, you can also open individual disks, here to D disk, for example, select D, click the lower configuration option, select only restore previous versions of the file options, and adjust the maximum usage, and press OK, close.
3. Click Create option, create a restore point up to the present, and enter the backup name, OK.
4. Turn on the computer, click the right mouse button on the D disk, select Properties, restore the previous version, and find a backup version that can be restored.