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I installed Ubuntu, on my work PC, a couple a years ago(2007?) on a separate partition. Typical setup that comes with the installation CD. The primary partition has WinXP. Due to new policies (and lack of use) I want to eliminate Ubuntu from my machine.

How can I do this without breaking my machine?

I was planning to just use GParted to reformat the partition th NTFS, but I fear there's a lot more to do. Does GRUB stop working?

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Your question indicates you no longer need Ubuntu on this machine and that space will be reclaimed for the use of windows XP.

You can eliminate the partitons from windows XP itself. As a precaution, take a backup of windows data before doing the steps.

Go to 'Settings -> Control Panel -> Administrative Tools -> Computer Management -> Storage -> Disk Management' from windows xp and simply delete and reformat the ext2/3/4 partitions which will be Linux partitions and create and format new windows partitions.

I assume the primary partition is windows XP and it is the one with boot flag.

Now you will need to fix MBR to remove grub and re-instate pure windows XP MBR. Refer (I personally did not use this in the past, but after reading it and remembering my past experience this documentation looks correct).

Now you should have PC without old Ubuntu.

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Grub will not stop working if it's installed on your primary partition(your xp).

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