... I do not have more ideas so far... :(
There is only one, check the security settings applied to those DLL's or OCX's that application cannot load, may Everyone or Authenticated Users execute them?
Also check their additional permissions.

>You cannot install an application as a regular user on NT/2000 regular users do not have permissions to write to the HKCR and HKLM, so the only fix i get so far is to make everybody member of Administrator ! Not a good solution at all, i may as well give a gun to a monkey !
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>Stephane
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>>And what does happen if you install that application as regular user, have you tried this already?