I have several VST's that do not load at all in Samplitude Studio 2016.  I have tried several times to get them to add but they do not.

Some work fine but others just fail to load at all...

They are all in c:\program data\VST folder...and that is where it is pointed to in the DAW.

I can add folders etc to prove that I have the correct folder, but several of the VST's just don't show up.

Am I missing something simple here or maybe the VST's are bad etc?

Please help,

Thanks

 Tony