Installing .Net 4.5 and NOT Windows SDK 8

I thought I could get away with installing .Net 4.5 without VS2012 or any of the SDK’s so that I could get a manual copy of code analysis working on our build server.
I was very wrong.
The very act of installing .Net 4.5 threw a number of errors to my previously working builds.

C:WindowsMicrosoft.NETFramework64v4.0.30319Microsoft.Common.targets(2836,5): error MSB3086: Task could not find “AL.exe” using the SdkToolsPath “” or the registry key “HKEY_LOCAL_MACHINESOFTWAREMicrosoftMicrosoft SDKsWindowsv8.0AWinSDK-NetFx40Tools-x86″. Make sure the SdkToolsPath is set and the tool exists in the correct processor specific location under the SdkToolsPath and that the Microsoft Windows SDK is installed [C:x.csproj]

and

C:x2.csproj(178,3): error MSB4019: The imported project “C:Program Files (x86)MSBuildMicrosoftVisualStudiov11.0WebApplicationsMicrosoft.WebApplication.targets” was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk.

What I did find is if i browsed to the registry key:

ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftMSBuildToolsVersion4.0

And renamed the key ‘11.0’ to ‘11.0-DoNotUseYet’. it seemed to revert back to windows SDK 7.0.

The worst part is it is running Windows Server 2008 which means I can’t install the 8.0 SDK anyway.