The desktop icons are gone after the boot.

Right-click the desktop, Arrange icons, display icons,
Task bar to see whether it is automatically hidden, or dragged down to the desktop.

(1). Click start → run, enter gpedit.msc in the Run dialog box that pops up, and open the Group Policy Editor when you return. In the Group Policy Editor, expand the local computer policy → user Configuration → administrative templates → desktop option. In the Content box on the right, delete the My Computer icon on the desktop, delete the My Files icon on the desktop, hide the Network Neighborhood icon on the desktop, Hide the Internet Explorer icon on the desktop, and so on, set the option's properties to disabled to retrieve the missing system-level icons on your desktop.
(2), you can use Ctrl+shift+del
Point New Task Input Explorer
And then there's the old icon.
. (3) 1. Look at the task manager, whether there is a Explorer.exe process, if not, the desktop will not appear icon, you can use Ctrl+shift+del in the new task Input Explorer can be loaded on the previous icon
2. If the right mouse button can be used, will display the icon a column tick should be able to

(4) Do not know if you click on the right button will be reflected, if you press the DEL, CTRL, ALT key does not respond to redo the system.
Desktop-click the right mouse button-click to Arrange Icons-click the Display Desktop icon
Right-click on the desktop → "Properties" → desktop items → the "custom desktop" to enter the settings, the desktop items you need to tick, and then confirm on the line.
First press Ctrl+alt+del to open Task Manager, (if you can't open Task Manager, you'd better redo the system). In Task Manager, "file"--"new task." In the pop-up Create New Task tab in the run input: Explorer.exe, and then click OK.
Or press Ctrl+ait+del, select Task Manager, click on the file--New task--browse, select the Explorer.exe run under C:windows.
Right-click on the taskbar, properties, click Toolbar, select Quick Launch
If not, open the Notepad program and enter the following:
[Shell]
command=2
iconfile=explorer.exe,3
[Taskbar]
Command=toggledesktop
Then save this file as: "Show Desktop.scf", you must confirm the filename and the same as in double quotes. Then copy the persisted show DESKTOP.SCF file to: "C:documents and Settings user name application Data microsoftinternet explorerquick Launch" directory. You need to replace the username with the user name you need to restore the Show Desktop button.
If not, it may be your system files are corrupted, desktop startup items are missing, proposed new installation department
4 ways you can look at that.