dllhost.exe and 50% CPU usage


  1. Naala
    Posts : 7
    Windows 7
       New #1

    dllhost.exe and 50% CPU usage


    Hi,
    I noticed this in RC I had installed before final Windows 7 version and it happened again few days after a new install, so for some time now dllhost.exe has been causing high CPU usage, always arround 50%. It seems it always happens while Im watching some movie or browsing movie folders, despite them being in details view (I read thumbnails can cause dllhost.exe to run high CPU). Anyway, movies are always there one way or the other when it happens, and it causes all my icons to disapear too. And it keeps running until I forcibly turn it off.
    I looked at Process Explorer and it seems ole32.dll CoGetTreatAsClass is the thread running high CPU. I attached a screen capture with dllhost.exe Threads window.

    I read somewhere turning off DEP for dllhost can solve high CPU without other problems but after few days it just happened again. I guess I will put DEP to default and remove dllhost for now, but other than that I have no idea, there are plenty of topics on the internet about dllhost.exe and CPU but I couldnt find any that has ole32.dll and dllhost.exe together.
    Its not a problem to shut off the process once it happens but I would rather see it get solved and not having to deal with it because it really bothers me.

    Im really thankful to anyone that has any idea what to do.
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  3. Orpheous
    Posts : 551
    XP Pro/Vista Ultimate (64)/Windows 7 Ultimate Signature Edition(64)
       New #2

    Hi Naala,
    I wouldn't touch your DEP settings at this stage, there used to be some pretty nasty exploits around that used dllhost.exe.
    "(DEP) is intended to prevent an application or service from executing code from a non-executable memory region. This helps prevent certain exploits that store code via a buffer overflow, for example."

    The first thing you should do is run a full system scan with your anti-virus program. If you don't have one installed, I'd recommend either Microsoft Security Essentials, Avira Antivir or Avast... you can find the links in this thread.
    Just for good measure, once the scan is complete (and your system is clean), I'd reboot into safe mode and run a full scan again - (hit F8 repeatedly while booting up, choose safe mode), although some antivirus programs may not run ok in safe mode
    If you're still having problems after that, please install hijackthis, run a scan and save a logfile, and post the .txt logfile here as an attachment
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  4. Naala
    Posts : 7
    Windows 7
    Thread Starter
       New #3

    Wow, thanks so much for your response, I never understood what DEP is so Ill read Wiki article and I already set it to default so it should be ok for now.
    I already scanned the system with Nod AV but Ill do it again in safe mode. If nothing comes up Ill post Hijackthis log tomorrow, as you said.
    Thanks a lot for now!
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  6. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       New #4

    Make a test - run your movie with another viewer, e.g. VLC ( Download VLC Media Player 1.0.3 - FileHippo.com ) and see whether that happens too. Whatever you use to view your movies, is trying to run something in emulation mode (that's what the ole32.dll CoGetTreatAsClass does). No idea why that would be the case because it happens apparently with all kinds of movies (are they all from the same source??)
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  7. Orpheous
    Posts : 551
    XP Pro/Vista Ultimate (64)/Windows 7 Ultimate Signature Edition(64)
       New #5

    Hi Naala,
    how did you go with your scans?
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  8. Naala
    Posts : 7
    Windows 7
    Thread Starter
       New #6

    Im really sorry for not responding earlier but the holidays came so fast and I just wasnt at home to deal with computer. Im just downloading hijackthis now and will run it after I get my sleep.

    whs: its not a specific file and I dont know how to reproduce the error. It just happens when it does. I did have movie on pause one time but other times I think I was just browsing movie folders. They are actually anime files with .mkv, .avi and a few .mp4 file types, all from different sources and I mostly use the KMPlayer to view them but I also use VLC. Last time it happened while I was changing .mp4 files to open with KMPlayer instead of Winamp and after closing Properties panel the icon didnt change and after checking Properties again I noticed CPU running 50 %. But it does happen far less often than before, since I opened this thread it didnt happen again, but its also true that PC was off a lot. I'll see what happens in the coming days.

    Merry Christmas to both of you!!!
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  10. Naala
    Posts : 7
    Windows 7
    Thread Starter
       New #7

    It seems I cant edit my post so Im posting new one because I just ran HijackThis and it was faster than I thought.
    But the log is really short and nothing like other logs Ive seen, I hope everything is ok.


    While Im here i would like to ask if anyone knows how to disable Nero BackItUp scheduler service that appears in the log too, I unchecked Nero Back up during Nero instalation but some files for BackItUp were installed in the Common Files folder and the service keeps running for nothing. can I just unregister it and forget about other files in the folder?

    Anyway, thanks for all your help, take your time and enjoy the holiday.
    dllhost.exe and 50% CPU usage Attached Files
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  11. Orpheous
    Posts : 551
    XP Pro/Vista Ultimate (64)/Windows 7 Ultimate Signature Edition(64)
       New #8

    Hi Naala,
    your short logfile just means that you don't have as many programs installed as others might, not a bad thing at all :)
    There's nothing in the file there that shows any malicious activity, but one entry that is unknown:
    O2 - BHO: D - {29C552F8-A694-308E-A6CF-117F19EE1958} - C:\Windows\system32\xwr58627.dll
    doesn't necessarily mean it's a bad one though.... don't use hijackthis to remove or fix any of the results that it came up with, it seems all clear for now :)

    From the sounds of it, it's most likely either a a KLM/VLC conflict, or one of the programs isn't closing properly. Make sure you download the latest versions If the problem persists, try uninstalling one and using the other... If that doesn't work, give Shark007's codec pack a whirl, it works well for me and a lot of others here
    Merry Christmas :)
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  12. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       New #9

    Naala said:
    It seems I cant edit my post so Im posting new one because I just ran HijackThis and it was faster than I thought.
    But the log is really short and nothing like other logs Ive seen, I hope everything is ok.


    While Im here i would like to ask if anyone knows how to disable Nero BackItUp scheduler service that appears in the log too, I unchecked Nero Back up during Nero instalation but some files for BackItUp were installed in the Common Files folder and the service keeps running for nothing. can I just unregister it and forget about other files in the folder?

    Anyway, thanks for all your help, take your time and enjoy the holiday.
    Have a look in Services whether you can find the Nero BackItUp scheduler. If yes, right click on it > Properties > disable.
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  13. Naala
    Posts : 7
    Windows 7
    Thread Starter
       New #10

    Yeah, I dont have many programs yet since Im installing them when I need them.
    I will check the internet for that file you pointed out to see what it is.

    I use Shark007 codec pack already and I love it too. My apps are the latest versions already and they do close down properly but perhaps I have some setting that doesnt like it (although Im pretty much on default with everything). I'll try uninstalling as you suggested and see where it takes me. Im really sorry now that I didnt pay more attention as to when it all began... If nothing works I'll uninstall all media apps and start from scratch.

    Whs, thanks for reminding me about Services, Im embarassed to say I totally forgot about them because I use The Ultimate Troubleshooter to disable all my startups and services (and of course I just removed a startup and didnt disable the service itself...)

    Again, thanks so much for both of your help and have a great end of the year!!!
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