INS-32025

The problem:

You can't install the 11gR2 Client on Windows, and are seeing an error like this:

Preparing to launch Oracle Universal Installer from C:\DOCUME~1\orauser\LOCALS~1\Temp\1\OraInstall2012-07-24_12-47-55PM.
Please wait ... [FATAL] [INS-32025] The chosen installation conflicts with software already installed in the given Oracle home.
CAUSE: The chosen installation conflicted with software already installed in the given Oracle home.
ACTION: Install into a different Oracle home.

Please press Enter to exit...

Basically, the installer thinks there's already Oracle software installed in the Oracle Home.
Assuming that you used - correctly - the deinstall tool, then be aware that the tool does not do a 100% job. It can fail to remove previous 11g entries in the inventory.xml file, located in (in my case) c:\Program Files\Oracle\Inventory\ContentsXML

So, manually remove the line pertaining to the Oracle Home that no longer exists, having backed-up the file first, just in case.