I upgraded from ISExpress to IS 3.5 SP4

I have some DLL's in the setup, which were set to
Extract COM Information. This worked great in IS
Express, but now the DLL's are not being registered
on the target PC.

When I buid the setup, I get a warning for each DLL:

"** Warning: -4354: The build was unable to extract COM information
from the file D:\Projects\Common Files\mydll.dll in component mydll.dll.
Please ensure that the file is self-registering and verify that the
self-registration process does not fail."

This just started happening with the newer version if IS.
The DLL's ARE installed on the target PC, but when I run the
application, I get "Class Definition MyClass is not found" on
the CREATEOBJECT's

Anyonwe know what's going on??