dynamic link library (DLL) initialization routine failed

Hi!
I would like to know how to unload a DLL that is used by another process.
You see, i have a process that tries to load DSETUP.DLL but the dll was
loaded by the process that calls my process. This blocks my process from loading DSETUP.DLL for about 5 secs (until the calling process is not in memory anymore).

Like I said, The error message is #1114 (A dynamic link library (DLL) initialization routine failed) is present for about 5 secs.

I think DSETUP.DLL (DirectXSetup library) can be loaded by only one process. If you know for sure, please post a reply.

Thank you!