Dual OS means 2 operating systems? If yes, then just insert the boot disk (operating system disk) and proceed with the normal installation method (as you normally do for the first operating system), But, you should specify the different drive like D: E: or others (other than C: because it already consists the 1st operating system). That's it. And the rest of the process is normal.
Whenever you start your pc, it will show you the list of the operating systems available in your PC, you can choose from them.
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