Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm using Windows 7 Professional SP1 (de, en, jp mui's installed before SP1 setup) with latest Intel HD graphics drivers and latest DirectX (to my knowledge)

On my Tablet PC, where rotating the screen is pretty standard, I have the following problem:

Whenever I rotate the screen to portrait mode and use the Windows Photo Viewer and close said program, It terminates with a "Com Surrogate" error in the "d3d9.dll" module.

Some with that an error of similar kind said it helped to copy over Windows Photo Viewer from an unaffected installation, but I do not have another installation with this MUI setup.

Any idea how to fix that error short of reinstalling Windows?

share|improve this question
Does the event log provide you with more information? Perhaps a dump? – Tom Wijsman May 21 '11 at 22:01
I wasn't able to get any dump when the problem still persisted. (see my answer) – private_meta May 24 '11 at 16:21

Turning off Data Execution Prevention (DEP) on dllhost (the COM surrogate) fixed similar problems for some people:

Execute Control Panel / System / Advanced System settings / Advanced tab / Performance Settings button / Data Execution Prevention tab, and see if it says below : "Your computer's processor supports hardware-based DEP".

If DEP is available, one can :

Turn DEP off : bcdedit.exe /set {current} nx AlwaysOff
Turn DEP on: bcdedit.exe /set {current} nx AlwaysOn

Reboot for the change to take effect.

If turning DEP off does not fix the problem, you should turn it back on.

share|improve this answer
Sorry, see my answer. – private_meta May 24 '11 at 16:21
Even though it didn't fix the problem, I am not deleting this answer, in case it might help somebody else in the future. – harrymc May 24 '11 at 19:27
up vote 2 down vote accepted

This is a typical problem for me it seems, fixing by desperately asking.

This problem persisted for several weeks. As I did not receive an answer by the time I set the bounty, I installed Picasa Photo Viewer and set it to default to work around the symptoms.

I wasn't able to check the answers here for a couple of days, so now I checked it again and and tried Photo Viewer, now it works without a problem. The only difference was the installed Picasa Photo Viewer. I can only assume it fixed something in my dx-lib usage, because it was literally the only thing I did. Even after uninstalling Picasa and using Windows Photo Viewer as a Default Setting does not create the error anymore.

I thank the for the answers for the bounty, but I can't reward it as I can't say that/if it helped.

share|improve this answer

d3d9.dll is a component of Directx. I would upgrade your video card drivers, maybe run dxdiag and run some of its tests in both landscape and portrait modes. Beyond that, check if there are any updates to directx itself that might fix it.

Edit: Sorry, didn't see that you already did video drivers and directx upgrades. Perhaps dxdiag might shed some light on the problem.

share|improve this answer
Sorry, see my answer. – private_meta May 24 '11 at 16:20

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.