MSB3422 Failed to retrieve VC project information through the VC project engine object model. MSB3425

I'm getting the following errors from MSBuild while trying to build a solution:

C:\dev\MySln.sln : warning MSB3422: Failed to retrieve VC project information through the VC project engine object model. Unable to determine default tool for th开发者_StackOverflow中文版e specified file configuration.
C:\dev\MySln.sln : warning MSB3425: Could not resolve VC project reference "C:\dev\MyProj.vcproj".

Have you got any ideas on what's causing this and how it can be resolved? I've seen other postings about similar, but different errors such as when the MSB3422 error has a different message and shows "Illegal characters in path.", but I haven't seen any useful information about how to solve the error I'm getting where it says "Unable to determine default tool for the specified file configuration.".

Thanks.

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I found this, but it doesn't really help:

http://social.msdn.microsoft.com/Forums/en-US/msbuild/thread/b470f111-9321-4b43-8bd1-7fcf67c2d402

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A colleague fixed this issue by reregistering the VC project engine dll:

C:\Program Files\Microsoft Visual Studio 9.0\VC\vcpackages\VCProjectEngine.dll