How do you remove Windows XP so that you can make the harddrive a slave on another PC?

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This world is not perfect. That is what makes it beautiful.

You do not need to remove XP to do this.
What you would be concerned with is the Win boot.ini file, and as long as the device is a slave it's not even read. Only the boot loader installed on your primary drive will be executed.
After booting with that configuration, you are free to repartition/format your now-slave drive if you wish to.

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I tried putting my HD which is the master in this computer into the other computer as master but then it wouldn't load windows. O.o
It just sat there on the loading screen before that.

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This world is not perfect. That is what makes it beautiful.

I assume its a quick paritioning like Chris said.

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