Strong name validation failed in Win 7 (64)

Hi Guys,

I am using two dlls one is signed and other one is not signed. These dlls are referenced and they work perfectly on win xp.

But when I upgraded my System to win 7 they stopped working and I started getting Strong name validation exceptions like

System.IO.FileLoadException was unhandled
  Message=Could not load file or assembly 

now I want to reproduce the same problem on windows xp 32, how should I proceed.

I want to turn on Strong name validation on Win XP, how should I do it.

The command sn -Vl on win xp says

No verification entries registered.

Thanks