Loopback as Primary DNS?

I’m having Event ID 5781 messges showing up in my event log (W2K Server – also DNS server) and I’ve read through quite a few of the postings on how to fix it. I think I’ve got everything set except for one thing…

When I try to use 127.0.0.1 as the primary DNS in my TCP settings, I get a message that the address is reserved and can’t be used. That being the case, how does one use the loopback as the primary DNS address?