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Answer: Do you mean you want to restore an OS which was overwritten by another? You can't. Once all of the important files have been overwritten, there's nothing much you can do except reinstall the original operating system from scratch.

Answer: A typical hard disk can only have one partition set to be the active boot partition, even though there may be boot programs on more than one partition.

Sometimes during installation of an OS, the boot location is changed to the new partition/OS bootstrap program. This leaves the previous partition/OS bootstrap program inaccessible. This may be corrected by configuring a Dual-boot option in the new bootstrap program to reach both OS.

You may be able to alter the active boot partition to reach the original bootstrap program, and add a dual-boot option to the original bootstrap program to reach both OS. I can recommend using the free/open software gPartEd to change this boot partition and SuperGrub to modify a GNU/Linux boot program.

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Q: How do you restore back your operating system if it written on by another operating system?
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