There is a solution to continuously kill dllhost.exe. You can find the vbs script you can run to actively kill it from the memory every 50 to 60 seconds.
http://trialsanserror.com/babybluescreen/2014/04/24/the-dllhost.exe-memory-leak
I don't know how long we have been telling Microsoft about this problem. I spent a afternoon with Microsoft 2nd tier tech support, and another 3 hours the next day before he believed me. He told me about all he could do was forward it, but he would never get any feedback. I thought I was doing well keeping update KB2670838 off my machine. But somehow, it got in again. At least this time I knew where to look and I un installed it and again, made it so it would not appear again. But it is sort of like the Bing toolbar - you can mark it so that it is not suppose to show up on your updates any more, but it comes back the next day. Sickening
What is so strange is that Microsoft, if they wanted to can ignore us, and just join any international 3D forum they like. They will hear the same thing from EVERYONE. KB2670838 is a BAD update and screws your computer up when it is installed and you are trying to work with 3D movies. I have come out looking like a hero many times just by uninstalling KB2670838 and it fixed my friends computers.
When did we tell Microsoft about this, April of 2013? And to date, they do not believe us??!! It has been over a year? Apple would not let a film problem fester this long.
If Sony Pro 12 ran under unbuntu or a Mac, I would drop Microsoft in a New York minute. They do not care about us film makers - even when Microsoft's own second tier tech support can see it with his own eyes.
Thank you for posting the above post. At least someone is taking action.
All the best,
jack