Cannot find sn.exe to sign Assembly

You need to install the Windows SDK 6.0a, not just the runtime.

If you've installed VS2008, you'll find it's already installed, and sn.exe will be here:

C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bin\sn.exe

Otherwise, if you don't have VS2008 installed, you can download the SDK individually here.

The file sn.exe is not available in the SDK. The current version of the SDK is 6.1, perhaps they removed sn.exe in this release.

open command prompt
type cd \
type dir /s sn.exe
you will get output something like

Volume in drive C has no label.

Volume Serial Number is XXXX-XXXX.

Directory of C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin

11/07/2007  12:01 PM            95,728 sn.exe
              1 File(s)         95,728 bytes

You found the directory :)
if not, there is no sn.exe in your system. Install SDK then.

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