Clear and Reset Thumbnail Cache in Windows 10  

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  1. djbillyd's Avatar
    Posts : 239
    Windows 10 Professional (x64) Version 2004 (build 21292.1010)
       #50

    Callender said:
    Use Revo then. I find Revo's rules problematic. Geek does reg scan. I also have an app that runs as a service and monitors uninstalls and detects leftovers including registry.

    Maybe I should have phrased the original comment better:

    Use a decent uninstaller program - not the one built into windows and make sure that you shut down any of the PDF program's running processes or services first.
    No biggie. I like Revo. Used it for really deep uninstalls like printer software/firmware. I may try Geek just to see how it works. After all, being a Windows Insider, it seems that I'm "trying" something all of the time. Good deal....
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  2. Posts : 9
    Windows 10 Pro 20H2 19042.685
       #51

    Could Failure to Delete the Cache Involve Ownership/Permissions?


    When the methods provided in Ten Forums tutorials (such as this one, Clear and Reset Thumbnail Cache) fail to clear the cache effectively, itís possible that a lack of User Ownership or Permissions may be blocking attempts to fix a Corrupted Thumbnail Cache involving protected system files.

    You can Take Ownership of folders and files by using the .reg file Brink created (see the tutorial for this). Right-click on the folder in question, bringing up the Context Menu. Clicking on the Take Ownership line in the Context Menu causes a command prompt to pop up which runs rapidly through these folders and files giving the User ownership of the primary folder, along with any files in that folder, any sub-folders and any files within the sub-folders as well.

    Click again on the primary folder, select Properties, Security, and Advanced. Being the owner you can now Add yourself to the list of those with Permissions; give yourself Full Control over these folders and files.

    I suspect that if you do this, you will then be able to run any of the methods given in the tutorials and successfully delete the Thumbnail and Icon Caches, permitting them to rebuild fresh, new, non-corrupt cache, hopefully solving your thumbnail/preview/icon problems (see also tutorials Rebuild the Icon Cache and Enable Icon Previews).
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  3. Posts : 3
    Windows 10
       #52

    EDIT: I can't believe it but I solved it. I suspect though that doing your bat files and such was the first step needed. After that I continued researching possibilities and found this:

    Thumbnail Previews Not Showing On Windows 10! Fix it

    I followed step 3 Where you go to system properties > advanced> performance settings>check "save taskbar thumbnail previews". Everything else of importance was checked but that was unchecked. Checking it caused thumbnails to immediately start generating. No idea why it worked but I am so grateful!

    [Rest of comment preserved as originally written]
    Please help me, I am going insane! 16 months ago my thumbnail cache for everything stopped working and nothing fixed it. I had to repair windows 10 which did solve the issue but it took many hours because I had to reinstall my programs and customize everything. I want to do everything I can to avoid that, especially if it's just going to keep happening! 16 months later and the exact same problem has happened. No icons work, not folders, photos, or video files. It happened when I downloaded a perfectly safe photo file. That file wouldn't show thumbnails and after that almost all other thumbnails wouldn't show (desktop still did), and upon deleting the cache they have all disappeared. I know the file is safe so that isn't it. I'm thinking I finally downloaded one photo file too many, or something. So this also rules out things like making sure thumbnails are enabled and so on, which I double checked anyway. Only .exe files show their icons.

    I've tried using your bat file here to reset thumbnails, tried the bat file to reset icons, I also tried doing them manually in administrator cmd prompt. Following the instructions to the letter each time including restarting (many times). I also tried using your file to give myself permission of the cache folder so it could delete all the files (interestingly iconcache_idx.db always comes back with the date of 3-16-21 under "date created" tab no matter how many times I delete it. All other files show today's date.) I tried merging the ico file recommended in option 2 step 4 to no avail. Besides which it's all folders and files. I tried resetting all file associations to default but that did nothing.

    I've run out of things to do, please help me!
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  4. Brink's Avatar
    Posts : 60,468
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #53

    solaris32 said:
    EDIT: I can't believe it but I solved it. I suspect though that doing your bat files and such was the first step needed. After that I continued researching possibilities and found this:

    Thumbnail Previews Not Showing On Windows 10! Fix it

    I followed step 3 Where you go to system properties > advanced> performance settings>check "save taskbar thumbnail previews". Everything else of importance was checked but that was unchecked. Checking it caused thumbnails to immediately start generating. No idea why it worked but I am so grateful!
    Hello,

    Interesting. I'm not sure why checking Save taskbar thumbnail previews below helped for this either unless it may have refreshed something that did.

    Enable or Disable Save Taskbar Thumbnail Previews to Cache in Windows
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  5. Paul Black's Avatar
    Posts : 15,317
    Win 10 Pro 64-bit v1909 - Build 18363 Custom ISO Install
       #54

    Hello @Brink ,

    Just a small point. In OPTION TWO - To Clear and Reset Thumbnail Cache using a BAT file, BOTH the .bat files have a section that says E) When finished, restart the computer to fully apply.

    Therefore, BOTH the codes need to include a Restart as per the below . . .

    Instant_Clear_and_Reset_Thumbnail_Cache.bat
    Code:
    
    @echo off
    
    :: Created by: Shawn Brink
    :: https://www.tenforums.com
    :: Tutorial: https://www.tenforums.com/tutorials/5655-thumbnail-cache-clear-reset-windows-10-a.html
    
    
    echo.
    taskkill /f /im explorer.exe
    timeout 2 /nobreak>nul
    echo.
    
    DEL /F /S /Q /A %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db
    
    timeout 2 /nobreak>nul
    start explorer.exe
    goto restart
    
    
    :restart
    echo.
    echo You will need to restart the PC to fully apply.
    echo.
    CHOICE /C:YN /M "Do you want to restart the PC now?"
    IF ERRORLEVEL 2 goto no
    IF ERRORLEVEL 1 goto yes
    
    :yes
    shutdown /r /f /t 00
    
    :no
    exit /B

    Prompt_to_Clear_and_Reset_Thumbnail_Cache.bat
    Code:
    
    @echo off
    
    :: Created by: Shawn Brink
    :: https://www.tenforums.com
    :: Tutorial: https://www.tenforums.com/tutorials/5655-thumbnail-cache-clear-reset-windows-10-a.html
    
    echo.
    echo The explorer process must be temporarily killed before resetting the thumbnail cache. 
    echo.
    echo Please SAVE ALL OPEN WORK before continuing.
    echo.
    pause
    
    echo.
    taskkill /f /im explorer.exe
    timeout 2 /nobreak>nul
    echo.
    
    DEL /F /S /Q /A %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db
    
    timeout 2 /nobreak>nul
    start explorer.exe
    goto restart
    
    
    :restart
    echo.
    echo You will need to restart the PC to fully apply.
    echo.
    CHOICE /C:YN /M "Do you want to restart the PC now?"
    IF ERRORLEVEL 2 goto no
    IF ERRORLEVEL 1 goto yes
    
    :yes
    shutdown /r /f /t 00
    
    :no
    exit /B

    I just thought that I would point this out in case you wanted to amend the files. I did test BOTH files out, and after running them, they did change to todays date and the time that I ran them.

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  6. Hemimax's Avatar
    Posts : 2,993
    Windows 10 Pro x64
       #55

    I got this running the bat file

    Clear and Reset Thumbnail Cache in Windows 10-image.png
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  7. Brink's Avatar
    Posts : 60,468
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #56

    Hemimax said:
    I got this running the bat file
    Hello Richard,

    Does the path below exist for you account?

    %LocalAppData%\Microsoft\Windows\Explorer

    OR

    C:\Users\<username>\AppData\Local\Microsoft\Windows\Explorer
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  8. Hemimax's Avatar
    Posts : 2,993
    Windows 10 Pro x64
       #57

    Thank you Brink, yes it does.
    I think my thumbnail display problem is because of ownership. There was no owner in the security properties of the JPEG files, probably because I recently installed W10 on a new drive.
    Is there a qlobal way to remove these unknown users (guessing from my old installation) or should I just leave them alone?

    Clear and Reset Thumbnail Cache in Windows 10-image.png
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  9. Brink's Avatar
    Posts : 60,468
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #58

    Hemimax said:
    Thank you Brink, yes it does.
    I think my thumbnail display problem is because of ownership. There was no owner in the security properties of the JPEG files, probably because I recently installed W10 on a new drive.
    Is there a qlobal way to remove these unknown users (guessing from my old installation) or should I just leave them alone?
    Usually, it's not a problem to leave the SID references for deleted accounts or accounts not currently available (ex: from another computer).
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  10. Hemimax's Avatar
    Posts : 2,993
    Windows 10 Pro x64
       #59

    Cool thanks again!
    Will your take ownership bat file trickle all the way down if I apply it to the parent drive? I have several data drives like that.
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