I am struggling to make sense of your environment, and of the precise steps you took during both install of Sonar and in the creation of the project that is having missing project components.
Also, when was Music Creator 5 uninstalled, and how?
On MY system, I have 64-bit Sound Center components at:
C:\Program Files\Cakewalk\Vstplugins\Cakewalk Sound Center
And 32-bit ones at:
C:\Program Files (x86)\Cakewalk\Vstplugins\Cakewalk Sound Center
I have a 32-bit and 64-bit SI String Section plugins that are outside of the Cakewalk Sound Center, at:
C:\Program Files (x86)\Cakewalk\Vstplugins\SI-String Section
C:\Program Files\Cakewalk\Vstplugins\SI-String Section
So, I am quite confused. I will try to help you, but I need to better understand:
1. Where your SI-String Section stuff is located
2. Why you are looking for 32-bit stuff when you have a 64-bit OS?
3. Why entire synths seems to be missing - which ones?
4. What version of Sonar you have, and is it 32-bit or 64-bit, or do you have both?
5. Is it possible some components are common, between Music Creator and Sonar, and that removing Music Creator may have deleted things that would normally be part of Sonar?
6. Probably lots more questions, but I need more coffee for them to materialize :)
Please review the above and respond, and add whatever detail you can. I will certainly do my best to help you, if I can get up to speed.
Bob Bone