Grasshopper error Rhino 4.0

I have set up a group policy object to rollout the latest version of Grasshopper to machines running Rhino 4.0 SR9.  The machines are Windows 7 x64.  The version of Grasshopper is 32-bit which I believe all Rhino 4.0 versions are except for Rhino 5.0 which can be 64-bit but we're not running that yet since it's still in beta.  I am having the group policy call a batch file which I specified here:

Computer Configuration -> Policies -> Windows Settings -> Scripts -> Startup

The batch file looks like this:

-- beginning of batch file
@echo off

c:
cd\
timeout /t 5 /nobreak
"\\servername\deployments\Grasshopper\vcredist_x86.exe" /q
timeout /t 15 /nobreak
"\\servername\deployments\Grasshopper\grasshopper_wip_20120122.exe" /silent

exit
-- end of batch file

Where "servername" is the name of our server, I just omitted it from this discussion.

After the machine reboots I log in as a user, open Rhino and in the command line I type "grasshopper" and hit enter.  I am then presented with the following error:

Rhino Plug-in Error
Grasshopper.dll
Unable to load Grasshopper.dll plug-in: Rhino version not specified.

Is there a step i am missing or does the syntax of the batch file need to be switched around perhaps?