essent 489 in Event Log on WIndows 8 Pro x64

I've been getting these in my Event Log for a while

taskhostex (2976) An attempt to open the file "C:\Users\Gary\AppData\Local\Microsoft\Windows\WebCache\WebCacheV01.dat" for read only access failed with system error 32 (0x00000020): "The process cannot access the file because it is being used by another process. ".  The open file operation will fail with error -1032 (0xfffffbf8).

According to Process Explorer "WebCacheV01.dat" is being used by: 

      dllhost.exe    5,576 K    7,648 K    1736    COM Surrogate    Microsoft Corporation


On a vanilla VM I use, Taskhostex.exe has them opened which is correct AFAICT.

Anyway to get things back to normal?
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Have you tried a Clean Boot to see if the errors stop?


How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8
http://support.microsoft.com/default.aspx/kb/929135




What Browser are you using?


How to use Reset Internet Explorer Settings (RIES)
http://support.microsoft.com/kb/923737#appliesto


Internet Explorer add-ons: frequently asked questions
http://windows.microsoft.com/en-us/windows7/Internet-Explorer-add-ons-frequently-asked-questions



If you test with another Windows user do you get the error?



Perhaps something on your machine is checking on your surfing history?


Windows 8 Forensics: Internet History Cache
http://cyberarms.wordpress.com/2012/08/21/windows-8-forensics-internet-cache-history/



I see lots of recommendations here for programs like -


Malwarebytes' Anti-Malware
http://www.malwarebytes.org/products/malwarebytes_free


http://www.malwarebytes.org/mbam-download-exe.php


SuperAntispyware
http://superantispyware.com/

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The solution couldn't have been simpler.  I just added 'WebCacheV01.dat' to the ignore list in Windows Defender.  Now TaskHostex.exe has it like it should.


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Wasn't Windows Defender giving you any notification about 'WebCacheV01.dat' ?  How did you work out it was Windows Defender trying to access the file in the first place?



Thanks for the feedback.

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The problem came back starting up my machine this morning.  I thought that during start up Defender had locked the file in order to scan it which caused the problem.  It seemed to work yesterday but not now.

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Do you have this problem in Safe Mode?


How to start Windows 8 in Safe Mode
http://www.bleepingcomputer.com/tutorials/start-windows-8-in-safe-mode/



Can you give a quick rundown on my original suggestions and questions if the fault has now returned.

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Sorry for the delay.  I narrowed it down to the fact that I am using auto log in.  The instructions to do this is here: 

Log On User Account Automatically at Windows 8 Startup

Logging into my account via the log in screen never produces this error.

I recently did a clean install of Windows 8 because of this problem and a few others.  I again activated auto log in and only get this error once in a blue moon.  I think maybe 2 times in the past 3 days instead of every time I restart or do a cold reboot.




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 2 times in the past 3 days is a bit often to be once in a blue moon in my opinion.  Still, it sounds a bit better than before.  I don't know what else to suggest other than to turn off automatic login.  Thanks for the feedback.

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Last updated October 25, 2019 Views 3,238 Applies to: