My OS is win7 x64, and java.com recommend that using java x86 version in your OS x64 or you can install x86 and x64 both in your OS, but the path of Java_Home (JDK or JRE) can using the x86 and x64 at the same time?
sorry for the page is Chinese... https://www.java.com/zh_TW/download/faq/java_win64bit.xml