Windows Vista launches the latest Windows Boot Manager as opposite to the NT Loader of Windows 2000/XP/Server 2003 plus utilizes a BCD store in its place of boot.ini. In this case what matter is that you require removing the latest WBM so that your PC stops looking for Vista after it has been detached from your dual-boot computer. To do this:

1.) Boot to any Windows Vista or the previous version of Windows.

2a.) If in Windows XP or former: Go Start->Run, type in cmd, and press enter.

2b.) If in Windows Vista: Click on the Start button, and select the Accessories from the start menu, and right-click on the command-prompt shortcut, and then click on the Run as Administrator.

3.) In the command prompt type in: Drive:\Boot\Bootsect.exe –NT52 All (including the two spaces), where "Drive" is the drive letter where the Vista DVD is located or the Vista ISO has been mounted.

4.) Reboot your computer.

5.) Open My Computer, and right-click the drive that contains Vista, as well as select Format.

6.) You can currently use this partition for extra storage or use partitioning software (such as Partition Magic) to merge that partition with another one.

NOTES:

1.) This can only be done if Vista is not the main operating system (i.e. Vista is on the first partition, frequently selected C:\). If Vista is the main operating system and you delete the Vista partition then you will also be erasing the boot files for the other installations of Windows, making your computer unbootable!

2.) If you have two installations of Vista, you do not desire to eliminate Windows Boot Manager. Instead you desire to change the BCD store as well as skip ahead to step #5. However, Note #1 still applies...you cannot eliminate that installation of Vista if it is the main Operating System.