Vista Tutorial - "Trust Not Granted" Error - Full Trust WPF Web App on a CorporateNetwork

I'm trying to create a WPF Web Application, that will ultimately run
on a corporate network - in otherwords the XBAP will be executed from
a network share.

When I execute the XBAP from the remote share I get the following
exceptions:

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed
later in the log.
* An exception occurred while determining trust. Following failure
messages were detected:
+ User has refused to grant required permissions to the application.
* An exception occurred while downloading the application. Following
failure messages were detected:
+ The AssertApplicationRequirements method failed. The application
cannot be committed.

The first thing I did was to create a public/private key pair:
makecert.exe -sv MyKey.pvk -n "CN=Mine" MyKey.cer

Then from this I created a PFX Certificate:
pvk2pfx.exe -pvk MyKey.pvk -spc MyKey.cer -pfx MyKey.pfx -po
MyPassword

I then created a new Windows Presentation Foundation Web Application
in Visual Studio 2008.
Next I set the properties for the application:

Signing:
Tick "Sign the ClickOnce manifests"
Select From File - I select the certificate file I've just made.
Tick "Sign the assembly"

Security:
Tick "Enable ClickOnce Security Settings"
Check "This is a full trust application"

Publish:
Publish Location - this is folder on the local hard drive that is
shared on the network.

I build and publish the applicaiton. It works fine on the local
machine.


Move to 'remote' machine on the corporate network.

Copy and install the certificate file I made earlier and store it in
the "Trusted Publishers" folder.

Browse to the development machines "publish" folder. Double click the
XBAP file. I'm presented with the "Trust Not Granted" - "The
application cannot be deployed because it is not trusted and possibly
unsafe." error. On clicking "Open Error Log" I get the exceptions
written above.

Any help would be appreciated as it's driving me nuts!

Thanks in advance

Matt