I am using Visual Studio 2010 Professional as provided by DreamSpark. I have recently installed Windows developer preview and when i publish my solution (XNA), i receive the error "An error occurred while signing: SignTool.exe not found." I have tried
copying an instance of signtool from "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin" to "C:\Program Files (x86)\Microsoft Visual Studio 10.0\SDK\v3.5\Bin" with no success. Any suggestions?
When you refer to "Windows developer preview", exactly what software did you install? Are you using the Windows 8 DP or to Visual Studio 11 DP?
In either case, you have installed pre-beta software and compatibility issues with existing production software are to be expected. If you had no problems with XNA before installing the pre-beta software, I suggest you remove it to restore the functionality
If you have questions on the Developer Preview software, here are the forums you want: