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When I tried to install MVC3 using Web Platform Installer, it said "Successful", but no MVC3 template when I tried to create a new project.
The Web Platform Installer shows no error.

So, then, I tried to use installer "AspNetMVC3ToolsUpdateSetup.exe".
(Download from here)
It failed and provided a log file.

The log file indicated some unexpected error, with the error code 0x80070643.

I Googled and tried a couple of solution, but none worked, but I finally found the solution here.

Essentially, it looks like we need to fix a registry entry for old "Microsoft ASP.NET Web Pages" package to be able to be uninstalled.

Here is the post to resolve the issue:

Mar 11, 2011 05:37 AM by Matt Garven

We experienced the same issue - I was unable to install because an old version of "Microsoft ASP.NET Web Pages" was still installed. However, the uninstaller was failing for the old version.

It seems VS 2010 SP 1 modifies the framework paths in the registry to contain a trailing backslash, which causes the uninstaller for the old version of "Microsoft ASP.NET Web Pages" to fail.

Steps to workaround are:

1. Remove the trailing backslash from the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\4.0.30319.0\Path

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ASP.NET\4.0.30319.0\Path

2. Uninstalled the old version of "Microsoft ASP.NET Web Pages".

3. Add the trailing backslash back to those keys.

4. Install MVC 3.

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