How to delete one win7 dual system?

  
        
Method 1, use diskgenius to directly format the c drive or d drive, and then set the remaining one as the active partition (this step is extremely important, if the failure is restarted, the computer will not start).
Method 2, enter the system responsible for booting (usually the one that is installed later) Click Start menu, enter MSConfig, there is a boot menu, delete the other system items in the startup, and then directly format another system. .

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