First a question: Why would you want to use W2K's registry in W98?
After you answer that, let me tell you why you don't want to do that. Although similar in outline form, Windows 98 and Windows 2000 registry are not close enough for just a copy or an import. The only way that even Microsoft thinks about both at the same time is when upgrading W98 to W2K and then only the application information is pulled over. Almost all other items in the registries are quite unique and you certainly don't want to mix them.
By messing with the registry - you can easily render a Windows 98 machine unbootable. By messing with the registry of Win2K, you can render it a paperweight.
All that said, I "mess" around with the registry fairly often - but I've had over three years of experience doing it, and I recognize the dangers of having an unbootable machine.
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J. Byron Todd
Computer Consultant
byron@toddcomp.com
Todd Computer Solutions