Show us this message, I've not seen that before.
Also as MSFT doesn't support XP anymore, we suggest Win7 as a minimum OS if you're running Windows.
Perhaps this is the warning dialog message you saw, but it refers to a prerequisite Java JDK 1.8 install...
Warning - Java Installer
Java 8 requires a newer version of Windows. You may continue with the installation, but for Java to work as specified
we recommend upgrading your computer's operating system. Please refer to http://java.com/sysreq.
This warning popped up on an old HP Mini netbook (XP SP3 + patches up to end-of-life) when installing jdk-8u45-windows-i586.exe.
The system requirements page for English is: What are the system requirements for Java?