Deanah, don't see why you would want/need 2 versions of Sonar....32 bit stuff works fine in 64 bit Sonar normally.
I would remove the 32 bit Sonar.
Then install 64 bit version in Program Files.
Install all 32 bit VST in Program Files
(x86) -> 32bit content needs te be in this folder....
Make sure to have the VST folder locations correctly set (Sonar,Edit in taskbar, Preferences, VST settings, VST paths -> make sure the folders for the 64 and 32 bit stuff is here.
Rescan VST and all should be ok.
good luck