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The last DAT I received was 5609 of 8th. May. Sometimes DATs may be published but not released for one reason or another.
What happens when you open Security Center and click "Fix"?
Security Center relies heavily on Internet Explorer being at its default setting so go into IE7 Tools/Internet Options/Advanced and click Reset. Then click Apply and OK, close and re-open IE. Now go to Tools/Manage Add-ons and re-enable any add-ons. Then you can close it again.
See if updating works.
Also, are you behind any sort of proxy barrier such as those used by universities and many other institutions?