Did you expand the MC7 item in the Command Center and run the SI Suite installer?
If you want all the old 32bit plug-ins to show up in MC7 add the path to your VST scan path settings. If possible locate and install 64bit versions of the old plug-ins instead. There is no 64bit version of CSC so the path to it will need to be added to the VST scan path in preferences. No need to install the MC7 version, the plug-in did not change.
If you have any 3rd party plug-ins which are 32bit only, there is a chance they will not run in 64bit MC7 using either BitBridge or jBridge (a third party alternative to BitBridge). If this is the case you have three options, find a replacement plug-in, use your previous Cakewalk DAW or install the 32bit version of MC7. Running the Command Center with "verbose install" enabled will cause the MC7 installer to provide an switch to install 32bit MC7. The "verbose install" option is on the settings page, click the gear in the upper right on the Command Center UI to access the page.