I have a new computer so I went to the Cakewalk website to download the Commander then downloaded all my Sonar products but the Sonar Pro desktop icon will not open Sonar nor will the target in the file open it. I have never had this problem. Does anyone know how to fix this....I miss my Sonar !

You could try temporarily disabling UAC (user account control), and see if this helps.
 
After some initial issues at the beginning, resorted to always running Cakewalk Command Center as administrator. I never had any issues since then. So you could also try that (and re-installing Sonar etc).
 
M.