Office boy did a thread about that & so did The_One.
I'll see if I can find 1 of them for you (I saved both of 'em

)
I haven't found the threads themselves ,but here is some text I copied so you can search for it.
This 1 is The_One 's post
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Message Text For:
Full instructions on how to make SETI@HOME run as a service on WinNT
The_One
Member Date Posted: Mar/31/2000 4:59 AM
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And here is a part of Office boy's post
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Installing Seti@Home as a system service in Windows NT (and now win9X) UPDATED
office boy
Senior Member Date Posted: May/30/2000 6:14 PM
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If you still can't find it let me know & I'll E mail them to you