Environmental error detected: The current Oracle Home and the Oracle Home passed from the installer are not the same

I'm trying to install onto my Windows XP which already has  I want both of them to run but I keep getting the following error when I install.
Environmental error detected: The current Oracle Home and the Oracle Home passed from the installer are not the same.  Net configuration Assistant cannot continue.

I'm not sure what to do.
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Hi May1210,

It is all to do with the Windows Register, when installing new set of Oracle software, choose the correct "HOME0" or "HOME1" etc

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You have to choose another directory for the new installation.
This directory is called ORACLE_HOME. It should be different from
all other installed Oracle products on the same computer.
So you have also to name this new ORACLE_HOME in the first
step installing the new Oracle.

Although it is possible it is not a good practice to install many Oracle products on
one PC machine. Oracle server is a huge product but your box is only a PC.

Also they both will use same PATH variable and so this can cause
confusing use of libraries and components.
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