CANT FIND SUPERIOR DRUMMER 2 IN SONAR X1

Make sure Superior Drummer.dll is in your vst folder, open the Plugin Manager and click the "Scan" button. If the dll isn't in \program files\cakewalk\vstplugins, find where it is and either copy it there or add whatever folder it is in to the vst folders list in Plugin Manager.

If the dll isn't in \program files\cakewalk\vstplugins, find where it is and either copy it there

 
If you copy the file to your VST folders you will be setting yourself up for troubles in the future.  There is no need for the Superior Drummer dll file to be in the Cakewalk Vst plugins directory.  All you have to do is to browse out to it's installed location via the VST Scan window and create a scan path to it.  Then rescan your VST plugins.
 
If you insist on having Superior Drummer's dll in the Vst plugins directory and it is not installed there then you must uninstall and reinstall the plug in with carefull attention to the installation options.

for some vsts just copying them over into another folder might work...but your only risking frustration down the line.

In Toontrack's case it is guaranteed you will have a problem.  It usually shows up when you buy a new SDX and it won't load or some other problem.  Then the user is asked if he is running the latest update which they answer "Yes" because they just downloaded and updated it.  But eventually, they discover that the DLL in use has not been updated and a new one has been created in the original directory.