On dual boot Ubuntu and Windows, If you like to uninstall / remove Ubuntu from your machine and like to have windows alone. Then you need to restore your original MBR and it can be done easily with Boot Repair using Ubuntu Live CD / USB.
To install the Boot Repair
You need to have Ubuntu Live CD or Live USB. Boot using your Ubuntu Live CD or Live USB, while booting choose Try Ubuntu.
Once booted then open a terminal, and run the following command one by one to install the boot repair.
To add boot-repair to the repository
sudo add-apt-repository ppa:yannubuntu/boot-repair
To Update your repository
sudo apt-get update
To install boot-repair
sudo apt-get install -y boot-repair
Once installation complete follow the steps below.
To Restore MBR
Run boot-repair on terminal by typing the following command or select it by System->Aministration->Boot Repair.
It will scan the System for few seconds and will pop-up a small window. Select Advanced options and in Main options tab select Restore MBR. Check the screen shot below.
Then select the MBR options tab, check the drive for MBR and Windows OS. By default all the options are selected correctly if not select the drive where your MBR is to be and the correct OS. Click apply now, check the screen shots below.
Once done click ok and restart your system and it should work. Then after logging in into your windows, go to Disk Management in Computer Management then select the Storage. Now you will see the list of all available partitions, there you select the linux partitions and delete it. Make a new partition from the deleted one and format it with ntfs. Thats it your done.
Hope this will be helpful for you!!!