How to detect running on 64 bit Windows

[Eric Daly]

I've been working on this for probably a month now... Basically I can get the Windows version and Service pack level, but the bit isn't accurately determined. The bit is always returned as the bit of the JRE that the code is running on (usually the 32 bit JRE is running, even on 64 bit sytems). Can anyone tell me a way to find the bit of the actual OS that is running, not just the JRE? Or even point me in the right direction? I tried doing this in C and C++, but it's just so complicated that it's not really worth my time to figure it out... Maybe I can just check if there's a folder called "Program Files (x86)" or some roundabout trick like that... it just seems like Microsoft should have made a way to check this without extensive coding in C or C++. Thanks for any help.

package com.linucksrox;

public class DetectOSVersion
{
    public static void main(String[] args)
    {
        String nameOS = System.getProperty("os.name");
        String versionOS = System.getProperty("sun.os.patch.level");
        String bit = System.getProperty("os.arch");
        System.out.println("OS: " + nameOS + bit);
        if (versionOS.equals("")) {
        	versionOS = "Plain";
        }
        System.out.println("Service Pack: " + versionOS);
    }
}