How to change my Java (32 bit) to Java (64) on my Windows 8 i7 64-bit?

I'm having a hard time with my Windows 8 during programming as well as playing Minecraft. My software keeps asking me to get 64-bit version of Java. But every time I try to change it from the oracle website. My computer still say it is 32 bit version. How can I replace the Java and have it on 64 bit? I always update my JRE and anything that has something to do with Java/Oracle. Can you guys help me out?

Go to the manual Java download selection page - here:
https://www.java.com/...manual.jsp

Get both the "Windows Offline" and "Windows Offline (64Bit)" packages.
They are the full system rather than just the web installer.

Install both once the downloads have finished.

32 or 64 bit programs will then use whichever version they need.