Adding Vista To XP Boot



I Have done this before but I can't really remember how, I have XP installed on my master and Vista running of the slave, I had to boot configuation running fine but I had to reinstall XP due to issues which overwrote my boot config, I tried adding it to the boot.ini but It just sitts when accessing it, and i can't simply unplug one harddrive as my boot config was set to be on the primary harddrive, I know theres a way to add Vista again, if anyone knows how please tell me :)

no problem my friend click in my computer propereties click to advanced in startup and system recovery click on setting(the 3third) press edit... and add this :
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="WindowsVista" /fastdetect /noexecute=alwaysoff /usepmtimer

or use diskpart or if the pc boots with vista install easybcd and add xp...

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