HELP - 'Can't find class' error

I have just bought a new computer with Windows XP and downloaded and installed the new versions of the jdk, jre, etc.
I have written the Hello World program to check that everything works. It compiles fine, but when I try to run I get an error - Can't find class helloworld - and then it exits.
I know that the path variable is set correctly and I used to have to set the classpath as well, but have been told that this is not necessary.
I really need to get this working as have some important programming to do.
Thanks for any help,
Olly

Try this;-
prompt>set CLASSPATH=
.......> return key
prompt>java helloWorld
Hello World!
prompt>
AMAZING!
This works fine. Thanx.
Is there any way to set it so that I dont have to do
the set classpath stuff each time I run a program
though?
CheersWell, set a system variable
CLASSPATH=.;<java_home>\jre\lib\rt.jar
regardws, Thomas

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