Can't open downloaded game. says need to be administrator. I am. tried 'repair disk permissions/no help...

Unable to open downloaded game. Says need to be administrator/I am. Repair disk permissions w/disk utility no help...what do I do?

This is what popped up after i typed all that in :
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
          at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
          at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
          at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
          at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)

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