Select everything inside the Code box with your mouse then right click and choose Copy.
Start Notepad (Start / Programs / Accessories / Notepad) then paste the data you copied in it.
Click on File then Save as. In the "Save in" window, click on the little arrow and pick Desktop.
In the File name field, enter "EditBoot.bat" (in double quotes as shown).
Click on Save then close the Notepad window.
On the desktop, click on the EditBoot.bat icon and you will have boot.ini in a Notepad window where you can make any changes you want. The batch file makes a backup copy of your current boot.ini file as bootbk1.ini, bootbk2.ini or bootbk3.ini so if you mess up it's easy to recover
Move the EditBoot.bat icon to some other folder once you're done with it so you can use it again if needed. You don't need ot want it on the Desktop.