see http://blog.mjjames.co.uk/2010/12/mvc-3-rc2-install-error-0×80070643.html
I had the common problem where vstudio 2010 wouldn’t update.
The following worked:
1) start AspNetMVC3ToolsUpdateSetup.exe, let it stop at the acknowledge screen
2) go to the c:\temp directory and copy the directory of unpacked files
3) run the vstudio kb update exe separately (mine worked)
4) then go back and run AspNetMVC3ToolsUpdateSetup.exe. I always ran as administrator.
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Tags: mvc3 install
