I think this is the same issue as this
viewtopic.php?f=28&t=973. Unfortunately, it seems it was never resolved.
Taking a quick look at what Reality_DS64.dll actually depends on, the only thing that isn't already included in DS or Windows are the MSVCP100 and MSVCR100 dlls. These are "
runtime components of Visual C++ Libraries required to run applications developed with Visual C++ on a computer that does not have Visual C++ 2010 installed". I do not know if the Reality or DS installer includes them, but on the off chance that they don't and your computer is fairly new it might be that you do not have them installed.
IF Reality's installer doesn't include them, it is probably because the DS installer used to, but perhaps the DS dependency has moved to newer versions, while Reality, not having been updated for years, has stayed the same.
Anyway, try installing
Microsoft Visual C++ 2010 Redistributable Package (x64) https://www.microsoft.com/en-us/downloa ... x?id=14632. Under no circumstances should it hurt, and it might help.
EDIT: No, this cannot possibly help (or hurt). DS already depends on the same DLLS. If they were not present in the system, DS would not work. Sorry about the noise.