For some reason the last three Platinum updates fail to load on my system.  Everything downloads OK, the files extract OK, but when it starts to register the files it fails, giving me an error having to do with OCX/DLL server error.  In working with Cakewalk's tech to resolve the issue, it was suggested that Windows Update may have been the problem since I was having issues there as well with the same updates repeating.  I fixed that issue and I manually installed the latest C++ v64 distributable, which failed because it was already installed.  I've tried everything I can think of and took every suggestion I could get from Cakewalk, the web, and the forum and I still cannot get the updates to load.  I'm running Windows 7 Home Premium on a Sony Vaio all-in-one.  I thought maybe the problem could be in the registry itself, so I got a registry cleaner, but still no update.  I know that I am not the only one with this problem.  If someone has solved it, please share.  

Here's the actual failure 

Unable to Register the DLL/OCX: Regsvr32 failed with exit code 0x3

jazzyd
I fixed that issue and I manually installed the latest C++ v64 distributable, which failed because it was already installed. 

Have you tried uninstalling, and then reinstalling the latest C++ x64 update ?

Sounds like Windows maintenance is not all applied.
 
Bob Bone
 

I just had the same error.  71 Windows updates missed.  It took all day but got the computer updated and then just loaded up the last SONAR update.  everything is working fine, now.
 
@

may need to run the utility mentioned in this post http://forum.cakewalk.com/FindPost/3393935

Same thing happened to me.  Took hours and hours to update Windows 7, but that was the problem.
http://forum.cakewalk.com/Latest-Update-Reg-Svr32-Failed-Resolved-m3410218.aspx
 
 
Watch out for that Win 7 Update that kills ASUS motherboards....
https://support.microsoft.com/en-us/kb/3133977

in my situation i like to re install windows quite a bit.
i like a fresh, clean registry, clean folders, exc.
before i started saving system images, i used to download the windows update packages straight from Microsoft.
this way when i re installed windows, i didn't need to do updates for hours.
been a while since ive done it but it was far more efficient then downloading updates every few months.

jazzyd
Here's the actual failure 

Unable to Register the DLL/OCX: Regsvr32 failed with exit code 0x3

I had the same thing recently and like the other replies it was windows update. Update ran for hours finding all the updates that were needed. That fixed it for me.

To answer two of the questions above, all of my windows updates are current, and yes I tried uninstalling the C++ update and reinstalling it.  Also when I look at installed updates in windows update, I have no failed updates.  Thanks for the suggestions, but it looks like back to the drawing board.