Presumed cause:
Layout Utilities is 32 bit application software
Platform taget of the project you made is "Any CPU".
(Platform taget of sample program is also "Any CPU")

Solution:
Change the platform target to "x86" and rebuild.
Then the application should work on 64bit environment.

Concrete steps to change the setting on VS2008
"Menu" > "Project" > Property of "User Project Name"  >
Property screen is shown > Choose "Build" from left tab >
Choose "x86" from list box of "Platform target".