>I finally got the NT4-SP5 box, and it had IE5.5 installed, but it doesn't have ActiveDesktop enabled. How do I get it?
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>I've already tried uninstalling IE5.5 and reinstalling it, but the setup did not have an option anywhere to install ActiveDesktop like IE has given me when installing on 95/98 machines. Do I have to do something lame like drop back to IE4 with AD and then upgrade ot IE5.5?

That's the MS-approved way to do it, unfortunately; MS in their infinite wisditude decided not to include the necessary shell component upgrades in IE5. You might want to check www.ntfaq.com for additional references regarding adding ActiveDesktop to NT without IE4; there was an article there that listed the components involved in the upgrade for NT 4.0 under SP3; unless there are replacement components involved in SP5 that can't be reliably replaced after an 'accidental' rollback of the SP, it should work without doing a complete deinstall/reinstall by applying the upgrade components and reapplying SP5.