A required .DLL file, DCLUSR50.BPL was not found

Hi,
I get the following error when I move my program to another PC:

A required .DLL file, DCLUSR50.BPL was not found

I compiled my program with the Project | Options | Linker | Use dynamic
RTL check box OFF but I still get the same error.

Could anybody help me?
Thanks,
Julian Ivanov