All that says is make sure you have Service Pack 2 installed but I already do? I've checked my View Update History and it was installed on the 28/08/10.
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RE: Can't install the new WLM 2011 BETA
Check Windows Update and download any updates. Restart your PC.
If you can't install the KB971644 Platform Update for Windows Vista, it contains the following updated technologies which you can download and install manually: