Is it possible that antivirus software is interfering with the DLL registration process?
 
I am looking at some things related to the reported error message at the top of the post - Unable to register etc.., and I saw a couple of different posts out there (not from this forum - the error can occur with other software and Windows), so I thought I would ask.
 
There is also a chance another program that is running, not antivirus software, is interfering with the install process.
 
For those who are having these errors, I recommend making sure as little as possible is running when performing the X2a update.  There are usually a horde of applications running - many are in the system tray, use Task Manager to see.  Or, do a selective start of Windows, with Start Up programs not allowed to load.  (also, if not already done, run the X2a update as administrator)
 
Bob Bone
 

Hi Bob...
 
I don't remember how I resolved this as it was so long ago, but I do know that the machine I was installing on did not (does not) have any anti-virus software installed... and I guess there could be something running in the background, but that machine is down to bare bones in that respect... Almost nothing running as I use the machine for Sonar only....
 
What finally got me installed? I don't remember... <sigh>...
 
Keni
 

WORK AROUND!!!
 
i had to format and re-install windows 7
installed sounds and video drivers
 
DID not install any WINDOWS Updates
 
Programs installed Fine a on drive D
 
IT MUST BE A RECENT WInDOWS UPDATE..
 
I am going to update now and set if it still works
 
 
Matt

Work Around continued.....
 
I updated to SP1 and no problems
 
I am convinced that the recent Windows update messed up something, unknown just yet.
I also think that if Sonar X2 is already fully installed before the recent Windows update you will be fine.  It's just us people that are re-installing X2 that are having this issue..
 
More to come....

WORK AROUND!!!!
 
So the work around for me was to reformat Windows 7
install drivers for video and audio
Then install Sonar X2 with all add ons
Then do a Windows Update
 
It works fine now
 
MY way was a bit radical but I wanted to clean up my hard anyway. 
 
The issue is a Windows update file that was downloaded this past week
 
That is where Cakewalk and Microsoft have to fix it
 
Good Lock
 
Matt

 
I had the same problems with
 
"Unable to register the DLL/OCX: RegSvr32 fai8led with exit code 0x3" and "The program can't start because mfc110u.dll is missing from your computer.
 
Here ist my solution:
 
1. Deinstall Sonar X2
2. Delete all Microsoft Visual C++ ... Redistributable Packages (X64) and install only Microsoft Visual C++ 2010 Redistributable and Microsoft Visual C++ 2012 Redistributable
3. Install Sonar X2
4. Install Sonar X2a
 
All works fine.