DLL Relocation

I have recently been receiving the following message every time I start my computer. Can anyone tell me in plain English what it means, and what are the implications.

"RTHDCPL.EXE - Illegal System DLL Relocation

"The system DLL user32.dll was relocated in memory. The aplication will not run properly. The relocation occurred because the DLL C:\WINDOWS\system32\HHCTRL.OCX occupied an address range reserved for Windows system DLLs. The vendor supplying the DLL should be contacted for a new DLL." (Quotation marks mine.

How does one get a new DLL? How does one install such a creature?

The computer seems to be functioning properly, and I haven't noticed any memory problem. Could this be the result of a a virus or other type of malware or is it simply a breakdown of the normal DLL functioning for some internal reason?