>What are some reasons why an OCX can't be registered on a PC?
>
>I have a client running Win98 and they can't register a third party OCX on their PC. Our setup.exe has successfully installed and registered this OCX on hundreds on PCs. However, this client can't get the OCX registered.
>
>When they run our app, they get an OLE error. When they try to manually register the OCX, they get an error.
>
>What kind of things cause this to happen.
>

Typically, some component required by the OCX is not present - a missing DLL, or the wrong version.

The registry might be full. THe maximum size is tied to the size of available virtual memory.

Under another OS like WIn2K or WinNT, the registry segment might be protected.

The drive containing the registry may be full, so it can't be expanded.