Uninstalling Ubuntu from dual boot / changing bootloader [duplicate]

I have a Win/Ubuntu 11.10 dual-boot setup, where I am running the OSes on separate partitions of my laptop HDD. I assume the best method of uninstalling is 'simply' a matter of deleting the Ubuntu partitions -once I've made sure control is given to the Windows bootloader instead of grub after POST.

The question is: How do I do that?

Stuff I've tried:

I tried the boot-repair CD (https://help.ubuntu.com/community/Boot-Repair), but that was a bit beyond my abilities to figure out if I could do it with that tool :/.

I also tried EasyBCD (http://askubuntu.com/questions/66070/how-to-set-windows-bootloader-as-default-bootloader). It couldn't identify my ext3 partitions, let alone change the bootloader.

Lastly, I tried installing startup-manager in Ubuntu, and using that to set the Win7 bootloader as default. But upon restart, it still loads grub.

Solution 1:

Set the hard drive that has the Windows/Ubuntu dual boot installed on it as the first boot option in the BIOS/UEFI.
If it doesn't automatically boot to Windows, use a Windows recovery USB stick to restore the Windows bootloader. If you have an MBR (Legacy) installation:
```
bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
```
For UEFI use How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10.
Delete your Linux partition using Windows Disk Management (right-click on your Start menu and select Disk Management).
(optional) For EFI installation only, mount the EFI partition by following the instructions in How do I mount the EFI partition on Windows 8.1 so that it is readable and writeable? and delete the Ubuntu folder.

_{Source: Revised from this answer}

Solution 2:

Step1

Boot into Windows and right click on My Computer.
Go to Manage > Disk Management.
Delete the Ubuntu installed partition and space reserved for swap. (If you want to use the space in Windows, format it and create a new partition. Or you can do it later.)

Step2

Reboot the computer.
Go to BIOS.
Set the boot media to CD/DVD
Put the Windows 7 DVD (or recovery disk) into the drive.
Boot from the DVD

Step3

Start windows repair (if you use windows 7 DVD or if you are using recovery it will automatically show repairing option)
Allow the utility to repair startup.
If utility found a error and fixed it reboot the machine and enjoy!!

If it failed follow step 4

Step4

Open command prompt in recovery mode.
Type diskpart and hit enter
Then type list disk and hit enter
Then select your disk (you can find it by size) - use select disk x to select the disk. Replace x with the relevant number.
Then type list part and hit enter.
Then select primary disk with mb in size (not in gb) - use select part x to select the part. Hit enter.
Then type active and hit enter.
Close the command prompt and again run the startup recovery tool.

Enjoy!!!

Solution 3:

I think that you can use Windows Recovery Console from the CD to "fix" the bootloader, i. e. deleting grub and replacing it with Windows' bootloader.