I just had to reinstall sonar due to needing to run a windows restore, and it wont detect addictive drums or addictive keys. I also reinstalled both of those, but they still arent being detected. Everything was reinstalled to the same directory as before, but I get this error message:
 

 
Anyone know how I can fix this?

First check to make sure that your plugins are actually physically on your computer.

Dimension Pro would have installed in the following location:
 
C:\Program Files\Cakewalk\Vstplugins\Dimension Pro
 
Addictive Drums would have thrown the ".dll" file in the following location: 
 
C:\Program Files\Cakewalk\Vstplugins
 
If neither are there then try installing them again. If they are there than simply try the following;


http://www.cakewalk.com/Support/kb/reader.aspx/2007013315
 
-DG