On a dual boot machine how do you change the default startup os

On a dual boot machine how do you change the default startup os
mel110755Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Depends on what you are using to dual boot.  There has to be a boot manager of some kind.  Assuming you're using the default Windows boot manager, then you would go to the System Control Panel, Advanced Tab, Startup and Recovery Settings button, and select the default from the drop down, then OK out.
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andrew_aj1Commented:
You can change your default startup OS by using msconfig. To open msconfig click start>Run (or WindowsKey + R), type 'msconfig', and click okay. From there go to the boot tab. You should see all the operateing systems setup in the boot.ini file in this window. Select which one you want as your default and click the 'set as default' button.
I hope this helps. Good luck.
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LeeTutorretiredCommented:
Since you asked this question in the Windows XP zone, I assume at least one of your operating systems is Windows XP.  I will assume also that XP was installed first, and the other operating system (perhaps Vista?)  If either of these assumptions is false, then let me know as it may change the answer.  But the easiest way to change the default startup OS is to type MSCONFIG.EXE in the Run dialog box off the Start Menu, click on the Boot.ini tab, then click the OS you want to be the default OS in the text of Boot.ini that is shown on that tab and click the button named Set as Default.  Then reboot the computer.
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LeeTutorretiredCommented:
Hmmm, must have been a few seconds late...   ;0)
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mel110755Author Commented:
Ok let me throw a wrench into the scenario. The user had a dual boot. Vista and XP. Xp was installed first as instructed.  The user also had two partitions. Vista was installed on the smaller partition. Since, the user has formatted the second partition that Vista was installed on. So there really is not second OS but because it was not installed properly on boot up it prompts the user for the OS to boot to. It is still defaulting to the Vista install.  I have used MSconfig and only the XP boot option is available to choose from.  
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andrew_aj1Commented:
Most likely you will have to open the Boot.ini file; located as a hidden file  on the root directory of the drive. Make a backup of it first before you edit it. You should be able then to remove the OS that you do not want anymore.
I hope this helps. Good luck.
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andrew_aj1Commented:
Here is some more information about this and a different way to access the boot.ini file.
http://support.microsoft.com/kb/289022
Good luck.
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LeeTutorretiredCommented:
>I have used MSconfig and only the XP boot option is available to choose from.

So what happens when you click on the XP boot option and then click the Set as Default button?
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willcompCommented:
The Vista boot manager would have been installed on the XP partition when Vista was installed. Most likely it is still the boot manager being used.

VistaBootPro is an easy way to edit the Vista boot manager. It runs in XP as well as Vista. Use it to remove the Vista Option and set XP to default OS.
http://www.vistabootpro.org/
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