I have 2 partitions (c: and d:) and on my D: partition is Ubuntu... how can I install new Windows on my C: partition...?

I think I have to change pre-install task of creating a partition so it doesn't delete entire disk but only use my C: partition...  Any suggestions?

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Community Chosen Answer


installation is not the problem. You are right, you need to simply format the C partition.

the diskpart script should look like:

select disk 0
select partition 1
assign letter=c

The main issue will be:

Windows will overwrite the MBR so your GRUB is not starting anymore which means, you can start Windows but not Linux anymore but Linux still resides on your hard disk!

Solution would be:

1. you restore grub (boot live linux, change to the kernel on your "d"-Partition and restore grub

2. you update the windows bootloader with bcdedit to enable the Linux boot from here:

http://www.icpug.org.uk/national/linnwin/step2-7.htm should be able to help you to create the correct post install task


Microsoft said in former times:
Multiboot? First install the outdated OS then the modern OS (they meant: at first Win98 then XP in that time I read this suggestion)
So simply install Windows first, Linux second ;)

Answered 01/03/2014 by: Nico_K
Red Belt

  • Thank you for your answer, and yes, im aware that the new windows installation will overwrite MBR so I won't be able to access Linux any more...

    but can you please help with some script as an post-installation task which will automatically correct this issue? The thing is, i have to do it for a dozen computers and it's too time-consuming if doing it for each separately...
    • did you read my link, where you have nearly 100% the post install script?
      The only two things you need to make on your own is: read out the ID and use it in the step later. As I am on a trip I am not able to verify that it works correctly so I don't write the code for you (which would be 5 lines)
      • Hi, I just wanna thank you again, I've made commands like said in the post you gave me but it didn't work because of missing grldr.mbr file... I have downloaded it and put it in C: drive but I still got error "Error: Cannot find grldr in all drives. Press Ctrl+Alt+Del to restart."
        I'm guessing maybe somewhere is named differently...
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You are on the right track. You just need to make sure you're not using any preinstall tasks that will wipe existing partitions. Just one that formats the "C" drive as NTFS. You also need to be careful about any tasks that replace the MBR. If you install the Windows MBR it may or may not pick up on your Ubuntu installation. Personally, I would leave the MBR as is and just add Windows to whatever bootloader you're using with Ubuntu (probably GRUB)

Answered 01/03/2014 by: BHC-Austin
Fourth Degree Black Belt

  • Thank you too for your answer. So, if I understand correctly regarding MBR, in pre-installation tasks part, it is not necessary to use "install mbr for 2008/vista/7/8/2012" task because then will computer use boot load menu of Linux ?
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