Is SONAR Professional the only version on the PC? If so, Dreamstation was dropped from the new SONAR. Perform an advanced install of another version to get the plug-in on the PC. The install process should handle the plug-in registration automatically.

Sorry. I haven't been very forthcoming with the details. My version of Dreamstation came with MC5 a while back. I've now upgraded to windows 7 on a new 64 bit computer. Everything (dim pro rapture, tts-1, etc etc), has transposed beautifully except Dreamstation. So frustrating. I was just getting the hang of this lovely little synth 

The new SONAR does not include Dreamstation, so you will have to install it from MC5, if you have not already done so. Are you saying you have installed MC5 and 32bit SONAR and Dreamstation is not available?
 

That's it yes. Though you've got me thinking. My MC5 installation didn't go entirely smoothly. I did it from a cd copied from my old computer. Maybe i should re-install MC5 direct from Cakewalk to make sure i've got a definitive version of Dreamstation.
 

Sorted!!  You got me thinking a bit more laterally, and getting back to basics. In fact for Dreamstation i had to go right back to my original MC2 installation cd. Still haven't managed to get 64 bit Sonar to recognise it, but i'm not too bothered about that. I've got a structure i can work with for those projects affected. Any future usage i can bounce to wav files and transfer.

dave t
Sorted!!  You got me thinking a bit more laterally, and getting back to basics. In fact for Dreamstation i had to go right back to my original MC2 installation cd. Still haven't managed to get 64 bit Sonar to recognise it, but i'm not too bothered about that. I've got a structure i can work with for those projects affected. Any future usage i can bounce to wav files and transfer.

Have you tried to wrap it using the dxshell app Scook linked to above? (If that doesn't work you may be out of luck.)

Yes, the only way a 32bit DirectX plug-in will ever load into 64bit SONAR is using a DX-to-VST wrapper. Then BitBridge can load the plug-in. Now that the plug-in is finally installed and recognized in a 32bit host, the wrapper has a chance of working.