I'm getting the same problem. I am running Win 7 64-bit operating system.

Have tried everything. I am running X1 Studio installation as Administrator (not just logged on with Admin priviledges). Have all virus / crypto apps turned off. Re-booted several times. Tried to install both 64-bit and 32-bit installs. Un-installed. Re-installed. Tried clicking "ignore" but that didn't work either. Same error message every time.

I give up. That's enough time wasted. I have just purchased the upgrade to X2 Studio in the hope that when it comes, it will provide a full and complete installation from scratch that will work.

Here's the error message:
C:\Program Files (x86)\Cakewalk\Shared Utilities\NullProxy.dll
Unable to register the DLL/OCX: RegSvr32 failed with exit code 0xC0000005.
Click Retry to try again, Ignore to proceed anyway (not recommended), or Abort to cancel installation

I am also getting the same error.  I can reproduce easily by simply opening up a cmd shell (run as administrator) and typing the command:

regsvr32 "C:\Program Files\Cakewalk\Shared Utilities\NullProxy.dll"

This produces a hard crash of the regsvr32 utility and reproduces the exact same dialog I got during the installation, with identical Problem signature:

  Problem Event Name: APPCRASH
  Application Name: regsvr32.exe
  Application Version: 6.1.7600.16385
  Application Timestamp: 4a5bcdd6
  Fault Module Name: nvd3d9wrapx.dll
  Fault Module Version: 8.17.12.9688
  Fault Module Timestamp: 4fc7b111
  Exception Code: c0000005
  Exception Offset: 000000000000214f
  OS Version: 6.1.7601.2.1.0.768.3
  Locale ID: 1033
  Additional Information 1: 7b1b
  Additional Information 2: 7b1b5a43583d18f3bdfe502d1f037971
  Additional Information 3: 2673
  Additional Information 4: 26735bc0a1facc722564ef02831ca94e


It appears that there is something in the NullProxy.dll that the Windows 7 registry service is puking on.

I also found references in another thread about a possible collision with a Windows Logo Verification program (or something like that). The resolution was to uninstall that application, but I do not have that on my system.  My system is completely new, with a fully updated copy of Windows 7.

Any other ideas?  I am all ears.

OK. Sorry for the stupid last paragraph ... the reference was from the post up at the top. 

After all of the issues with the registry service failing on install I went ahead and just started SONAR up and it seemed to be fine. I then installed the 8.3.1 update, and after failing with the same error again saw that the version updated and the program still seems to work.

There is definitely still a bug out there, but I'm operational now.