Let me begin:
1) The first wrong move you made was using Norton. Norton is probably one of the worst virus scanners one can obtain.
2) The second one is not paying attention to the file in question (that Norton revealed). If you were to look at the given path in the "virus scan", you would notice that it is a JRE native classfile; which means, it is included with the standard Java distribution and completely harmless. If you are not convinced it is harmless, try to get in touch with Sun and ask them what the class is/does.
3) The last wrong move you made was using Vista. Vista is a complete crock of shit and should not be used on any computer.
Thanks for wasting my time.