Error Reading Form

Hi all.

I'm using Delphi 5 Enterprise.

I've had Delphi installed on another machine, but the disk has died.
I've installed Delphi on another machine and now I get this error
message on my program:

Error Reading Form
Class TSelectDlgT not found. Ignore the error and continue? NOTE:
Ignoring the error may cause components to be deleted or property
values to be lost.

Any help is very appreciated.

Thanks a lot in advance.

Best regards,
Joaquim.