Visual Studio 11 Developer Preview - Breaking FxCop Static Analysis

After installing the Developer Preview our Custom FxCop rules project won't build as the following Dll's can't be found:

FxCopSdk.dll & Microsoft.Cci.dll

It turns out that this is a red herring, looking at the project for the custom rules on other's machines, it doesn't build without re-referencing the aforementioned dll's correctly (so that's normal) 开发者_开发技巧the real problem is that our existing build is using the VS11 code analysis.

I've now removed VS11 but it's still not working!

Any ideas?

Update: Since installing vs11 my build batch is defaulting to the VS11 version, this isn't happening on other who have installed the preview [and they are also using x64 windows 7]

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I've seen problems with VS2012 interfering with VS2010 on a few machines so far it's been easy to flatten the machine and rebuild from scratch.