If you have created a dual boot system and then decide to go back to a single boot, you may find that, even though you have removed the second boot partition, that when you boot your machine you are presented with a menu asking you to choose which operating system to boot to. In order to remove the second (or removed) entry in the boot.ini file, proceed as follows:
1/ Click the Start button.
2/ On the Start Menu click Run.
3/ In the Run dialog box type: 'msconfig' (without the quotes).
4/ The System configuration utility window will now open.
5/ Click the Boot ini Tab.
6/ In the boot ini tab click the button marked Check all boot paths.
7/ The system will check the boot paths and remove any invalid ones.
8/ Finally Close the System configuration utility.
9/ You will need to restart your pc for the changes to take effect.