Rhino 5.0 x64 failed to load Vray 1.5!

[kibo]

Recently, I become to receive those message:

It appears Rhino failed to load the plug-in
C:\Program Files\Rhinoceros 5.0 WIP (64-bit)\Plug-Ins\VRayforRhino\VRayForRhino.rhp
the last time you used Rhino.
Do you want to stop using this plug-in?

Please help, without V-Ray work is suffering.
Thanks

[-Keith]

Hello Kibo,

Most of the time when I see this error it is solved by installing the latest RDK:
http://download.rhino3d.com/RDK/4.0/release/download/

Sometimes you have to completely remove and re-install V-Ray, make sure you are logged in as an administrator when you do install.