Press Ctrl + Shift + Esc to open Task Manager.Click on File > New Task (Run...).Type explorer.exe and hit Enter.
Downloading the wrong architecture is a common mistake. If you are running a 64-bit version of Windows 7 (which most users are), but you download a 32-bit explorer.exe , it simply will not work. It may fail to launch, leaving you with a black screen once again. Download Windows 7 Explorer.exe
Here are the safe methods to restore explorer.exe without risking a virus. Press Ctrl + Shift + Esc to open Task Manager
Once extracted, replace the old file: