When one of our clients tries to install our application, he gets: "Setup Error 299 Object 67. Setup files may be damaged..."

Here is line 67 of setup.stf:

67	Yes	MFC42.DLL		InstallShared	"Tx4ole,Mfc42Dll,MFC42.DLL,,14"					%M

The problem appears to be related to installing MFC42.DLL for use with our ActiveX TX Text Control, but I'm stumped on what to about it. Any suggestions? Thanks.