Hi ericchoovw,
"Debugging WPF Application"
Sounds like your application is trying to load something from a dll that is not present on your winxp machine, or if your program is built for a x64 machine maybe you're trying to load a x64 dll in a x86 environment which won't work.
The best way to solve this is to share source code of your application. I can debug it quite quickly for you if you want :)
Thanks,
G.