MIDI Device Name Matching

Windows midi driver assignments can be a bit frustrating. Unfortunately the friendly names will not make any difference to windows or Sonar finding midi devices - they are for your reference only. What is the name that windows/Sonar gave the midisport before you changed it? Did you by any chance install the midisport and then move it to another port causing windows to see it as a new device and assign a new port (usually designated by a 2 in its original 'unfriendly' name)? Did you install multiple or additional devices in a different order to the old system? 
 
The output order of midi devices is quite simple to change under preferences if that is the issue. If windows has assigned multiple ports, you need to uninstall the 'additional' device and move the midisport back to its original port.
 
 

You can change the the midi output order using 'move checked devices to the top'. The midi input order can't be changed this way,  but it will not affect projects loading - only the midi outputs being different will cause Sonar to ask you to re-assign ports.
 
It is possible to edit the ttseq.ini file to change the midi input order in the track input drop-down list if you wish to, but again, this will not affect loading projects. It is simply for convenience.
 
 What name is the midisport showing up as on your new system (you have posted a pic of the friendly name, but I can't tell what it was originally called)? This may be a clue as to what the problem is. It is listed under your midi devices beside the friendly name.