Eliminate Double boot (windows)

As shown in the picture beside, Dual boot usually happens because people want to install the operating system, but sometimes can also occur due to installation error, when there is a dual boot on a computer system, it will show the options menu for the operating system to be run, and computer systems will not run either an existing operating system, if this happens because of an error during installation of the operating system, it will definitely make the user feel less comfortable when going to use a computer.
how to eliminate dual boot? consider the tips below:

• Right click on My Computer, then select Properties.
• the system properties window, select the advanced tab
• and click the settings on startup and recovery box to display startup and recovery window
• at startup and recovery window, click edit
• then you will see the notepad window that appear titled Boot, contains code like below :

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
 

• code blue and red is the sequence of operating system installed on a computer system, please remove one and save the boot file
•  close all windows settings by pressing the ok button
• restart your computer and see the results.

good luck, may be useful