13 Aug 2007
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19 Oct 2012
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Any chance you're trying to upgrade from v5.0 ? There were some issues with .config files not being registered back then and Telerik released a hotfix for that?
Perhaps reading this thread http://www.sitefinity.com/devnet/forums/bugs-issues-/heads-up-postpone-new-version-5-small-business-edition-projects might help you to isolate the problem...