I suggest you re-read the instructions and see the debugging section which I've just added on
www.pagefault.orgThe howto is expanded, it goes into a little more detailed, so non-sysadmin people should be able to sort things out a little better if they get into trouble (rather than e-mail me;).
Do understand this isn't a trivial process, and I would encourage you to purchase the service-link virus scanning product if you are able to.
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Damien