How to I get Sharepoint central administration to open?

I have just installed Sharepoint 3.0 on to a fresh Windows 2008 Server (standard edition), running IIS7. When I try to launch central administration, the browser just tries to download a file. If I download the file and open it in Notepad, it is just a load of characters (excerpt attached - first few lines).

All the roles have been installed except "Anonymous Authentication" which isn't an option in the roles installation tool.

Any ideas would be gratefully appreciated.
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emjxConnect With a Mentor Author Commented:
Solved - installed WSS 3.0 SP2 and all is now happy.
I would make sure that you have followed the steps outlined in the following two posts to correctly set up Windows Server 2008 and WSS 3.0. One of the tricks is that you _must_ be using at least WSS 3.0 SP1.
emjxAuthor Commented:
I am pretty sure that I haven't missed a step, it looks like some encoding issue, but how to resolve... clueless!
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