You need to set target platform to x86. By default visual studio build is set to target all platforms. To change this in VS 2008. Go to the tools tab select Options. Expand the projects and solutions tab and select the general category. Under general check the show advanced build configurations box.
Now go to the build tab and select configuration manager ( this will only appear after the check box has been checked) Under the platform drop down list select new and then select x86 from the platform options. You may need to re-add the references once more. Then run the project.
Just remember 64bit platforms aren't supported by the GDK. However they will still run on a 64 bit machine because windows will still include the x86 assemblies.
" The best slaves are the ones who think they are free. "