Hi,
You can follow these steps
1) Press CTRL+Alt+Del
2) Click Task manager
3) Choose process tab
3) Check if there is any process called "Explorer"
4) If yes choose the process and click end process if it is not follow step
5
5) Click on Applications Tab -->New task
6)Type In "explorer" in the open box
7)Press ok
This start the explorer service and you can see the desktop
or
Refer
KB162031
KB256194
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