VS 2010 on a Win 7 OS to Win XP OS Issue

Hey Forum,

I have VS 2010 installed on my Win 7 pc - This is an upgrade from My XP OS using VS 2005.

An application that is in use needs to be modified. I make the modifications in VS 2010 and debug and everything works.

I publish it out and on the XP OS's that install the new version, I get that an error has occurred and the application closes with no time to find out the error.

I made sure that I was using .net 2.0 - But I cannot see where any other issue may be.

Has this happened to anyone else - but really how can I modify and publish to XP OS's?

Thanks