Having trouble running class

Hi
I'm having problems running java classes on my new computer. I'm using Vista 64 Ultimate with SP1 and JDK 1.6.0_07.
I can type javac -version and java -version in cmd and output is fine. I can also succesfully compile java files by typing javac helloworld.java (if I'm in a folder with helloworld.java). The problem is that when I try to run my compiled java by typing java helloworld.class I get the error:
Exception in thread "main" java.lang.NoClassDefFoundError: helloworld/class
Caused by: java.lang.ClassNotFoundException: helloworld.class
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
How can I fix this problem?

Do this and post the exact complete output for us... (just copy and paste from the command window (mistakes and all) into the forum editor, then select that text and press the code button conveniently located directly above the editor window
javac -version
java -version
javac helloworld,java
jaca helloworld
Cheers. Keith.

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