What to do with two systems after reloading the system

The solution is to delete the old system's files and reload the system format system disk.

1, Reload system format system disk, this is nothing to explain.

2, delete on the system files in two steps:

The first step: Delete the Oldwindows folder, which is in the root directory of the system drive letter, can be seen directly.

The second part: Run Msconfig, the boot to delete the non-default of the Windows7, this step can only be an example screenshot, because only when the dual system installed in the case will be displayed.