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Aug 27, 2008 08:26 PM|LINK
I remember an issue when I first started using WCF services on my XP box. I had to go into iis and map the .svc extension appropriately so iis knew what to do with it.
I recently had to do this again after installing the VS2008 SP1.
Its worth the effort to see if your file mappings in IIS are correct.
Hope this helps