What should I do if the Win7 system start menu is missing?

  

First, enter “regedit” in the Run dialog box, click OK to enter the Registry Editor;

2, and then expand to locate HEY_CURRENT_USER//SOFTWARE//MICRSOFT//WINDOWS//CURRENTVERSION //POLICIES//EXPLORER inside;

3, then find the DWORD value of the "NoDriveTypeAutoRun" key, change its value to 0, then exit the registry, restart the computer.

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