If you killed your explorer.exe by mistake...here is how to run it again:
From Task Manager, execute EXPLORER.EXE;
Hit
Ctrl-Alt-Del and load Task manager.
File --> New Task (run)-->EXPLORER.EXE
From Task Manager, execute EXPLORER.EXE;
Hit
Ctrl-Alt-Del and load Task manager.
File --> New Task (run)-->EXPLORER.EXE