Jeff - As you can see in this image, the path to your templates might be more than just "Cakewalk Content." Try "D:\Cakewalk Content\SONAR Platinum\Project Templates" (without the quotes). Then see if you can open a new project. You might have to close and restart SONAR.
 
If that didn't work, you have to find those templates. Go back to Preferences|File|Folder Locations and on the right side of the Templates line click the "Browse" button (note: it's the button with "..." on it). You'll see  standard Windows file dialog, and your job is to search for the correct "Project Templates" folder and select it, then click "OK."
 
Let us know if this gets you back up. Note that you might have to go down that whole list of locations in "Preferences" and repeat this process.

Larry ... Hallelujah .... followed your advice and typed in what you quoted in templates ... and it worked !!! ... I'm so relieved ... been stressing me for a couple days ... thanks so much ... And appreciated the others that inputed as well to help out ... Sonar forums come through again as usual ...whew ... THANK YOU ...

Glad you got it working. As mentioned above you might have to do this for the rest of the file locations. Next time something doesn't work, check your file locations.

Thanks Larry ... much appreciated ...