Article: This could also be labeled as a Recovery disc. If you don’t have an installation or recovery disc, you can create a recovery disc in Windows. In order to boot from your recovery disc, you’ll need to set your BIOS to boot from your CD/DVD drive. When the computer first starts up, press the BIOS setup key. This is typically F2, F10, F12, or Del. Navigate to the Boot menu and select your CD/DVD drive. Once you’ve selected it, save and reboot your computer. From the Recovery Disc’s main menu, select the Command Prompt option. If you are using an Installation Disc, select “Repair your computer”, which should open the Command Prompt. Performing this command will remove the dual-boot option when you start your computer, and boot straight into Windows. Enter the following command at the Command Prompt:bootrec /fixmbr When you reboot, you should not see the option to select Ubuntu. Instead, you will be taken directly into Windows. Once in Windows, it’s time to get rid of the old Ubuntu installation and reclaim the hard disk space. Press Start, and the right-click on Computer/My Computer. Select Manage and then click Disk Management in the left frame of the Computer Management window. In Windows 8, press the Windows key + X and select Disk Management from the menu.    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/87\/Erase-Ubuntu-Step-6Bullet1.jpg\/v4-460px-Erase-Ubuntu-Step-6Bullet1.jpg","bigUrl":"\/images\/thumb\/8\/87\/Erase-Ubuntu-Step-6Bullet1.jpg\/aid691416-v4-728px-Erase-Ubuntu-Step-6Bullet1.jpg","smallWidth":460,"smallHeight":321,"bigWidth":"728","bigHeight":"508","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"} Right-click on your Ubuntu partitions and select Delete. Make sure that you are deleting the correct partition. Once the partition is deleted, it will become unallocated space. Right-click on your Windows partition and select Extend partition. Select the free space just created to add it to your Windows installation.

What is a summary?
Insert your Windows installation disc into your computer. Boot from the CD. Open the command prompt. Fix your Master Boot Record. Reboot your computer. Open Disk Management. Delete your Ubuntu partitions.