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If you can't install Oracle Express XE 11g 2 on Windows...

I spent the whole afternoon trying to set up a Oracle Express instance without any success.
I had the drivers installed, but I could not uninstall them.
It looked like the main instance was not correctly set up. After looking around, I noticed that even after complete uninstall of Oracle XE still the ORACLE_HOME environment variable was still there. I tried again manually removing it from System Variables and then reinstalling... and it finally worked!

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