More than one version on java installed?

I am having difficulty running a simple 'hello world' program on my machine. I have installed jdk1.3 and I can compile a .java file with no errors but when I try to run it I get the following error: Exception in thread "main" java.lang.NoClassDefFoundError: FileName
This seems to imply that I am using the wrong file name (as I get the same error if I deliberately misspell the filename), but I'm not. I think that there may have been an earlier version of the java sdk (122) on this machine previously - there is an empty jdk122\bin folder. Could this trace of an earlier installation be giving me problems?

No, your classpath is not correct. Search the forums for NoClassDefFoundError, this question is asked very frequently.

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