reboot the computer

I tried to install another version of XP on my laptop but it failed few time so I up dated de existent version.
the problem I have now is every time I reboot the computer it goes first to the installation that failed which means every time I have to redirect it the working installation, so I ask you if you can help me to either remove the failed version or a way for my computer to go to the working installation every time I reboot it.
Thank you all

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