将鼠标悬停在 Windows 11/10 PC 任务栏上任何打开的程序图标上，您将看到任务栏缩略图预览。当您打开了这么多程序时，缩略图预览对于在程序之间切换非常有帮助，因为它可以让您快速浏览您在打开的某个程序上的哪个屏幕。

任务栏缩略图预览^{(Taskbar Thumbnail Preview)}不起作用

如果您遇到此问题，您可以尝试以下我们推荐的解决方案（不分先后顺序），看看是否有助于解决问题。

1. 启用任务栏缩略图预览
2. 运行 SFC 扫描
3. 修改 Windows 注册表
4. 执行系统还原

让我们看一下关于列出的每个解决方案所涉及的过程的描述。

1]启用任务栏缩略图预览

如果您的 Windows 10 设备上的任务栏缩略图预览不起作用^{(Taskbar thumbnail preview is not working)}或无法为您显示，首先要尝试检查并确保任务栏缩略图预览已启用^{(ensure that taskbar thumbnail preview is enabled)}。如果不是这种情况，您可以尝试下一个解决方案。

2]运行SFC扫描

如果您有系统文件错误或损坏，您可能会遇到此问题。系统文件检查器是Windows中的一个实用程序，允许用户扫描Windows系统文件中的损坏并恢复损坏的文件。运行它看看。

3]修改Windows注册表

这是一个两步修复，涉及删除DisablePreviewDesktop注册表项，然后更改 NumThumbnails注册表项值。

由于这是注册表操作，建议您备份注册表^{(back up the registry)} 或 创建系统还原点 作为必要的预防措施。完成后，您可以执行以下操作：

删除 DisablePreviewDesktop^{(Delete DisablePreviewDesktop)}注册表项

• 按Windows key + R调用“运行”对话框。
• 在“运行”对话框中，键入regedit并按 Enter 以打开注册表编辑器^{(open Registry Editor)}。
• 导航或跳转到下面的注册表项路径：

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced

• 在该位置的右窗格中，右键单击DisablePreviewDesktop 注册表项

注意^(Note)：根据您的Windows 10版本，您可能会看到DisablePreviewWindow条目。

• 选择删除^(Delete)。
• 在确认提示上单击 是。^(Yes)

更改 NumThumbnails^{(Change NumThumbnails)}注册表项值

• 现在，导航或跳转到下面的注册表项路径：

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Taskband

• 在该位置的右侧窗格中，右键单击NumThumbnails条目以编辑其属性。

如果该键不存在，请右键单击右侧窗格中的空白区域，然后选择新建^(New)> DWORD（32 位）值^{(DWORD (32-bit) Value)} 以创建注册表项，然后将该键重命名为NumThumbnails 并按 Enter。

• 双击新键。
• 在属性对话框中，将数值数据^{( Value data )}设置为 以 十六进制为基数的^{(Hexadecimal)}10 或  以 十进制为基数的^(Decimal)16。
• 单击确定^(OK)或按 Enter 保存更改。
• 退出注册表编辑器。
• 重新启动您的电脑。

在启动时检查问题是否已解决。如果没有继续下一个解决方案。

相关^(Related)：使任务栏缩略图预览显示得更快。

4]执行系统还原

如果任务栏^(Taskbar)缩略图预览之前运行良好，那么您的系统可能已经经历了一些您不知道的背景更改，现在正在干扰任务栏^(Taskbar)缩略图预览的正常运行。在这种情况下，您可以将系统恢复到 系统正常工作的较早点。

这些解决方案中的任何一个都应该适合您！

相关帖子^{(Related post)}：使任务栏缩略图预览尺寸更大。

Taskbar Thumbnail Preview not working in Windows 11/10

Hovering over any open program icon on the taskbar on уour Windows 11/10 PC, you will see the Taskbar thumbnаіl preview. Whеn you have so many programs opеn, thumbnail preview will be quite helpful in switching between programs as it gives you a quick glance of which screen you’re on some program you have open.

Taskbar Thumbnail Preview not working

If you’re faced with this issue, you can try our recommended solutions below in no particular order and see if that helps to resolve the issue.

1. Enable Taskbar Thumbnail Preview
2. Run SFC scan
3. Modify Windows Registry
4. Perform System Restore

Let’s take a look at the description of the process involved concerning each of the listed solutions.

1] Enable Taskbar Thumbnail Preview

The first thing to try if the Taskbar thumbnail preview is not working or showing for you on your Windows 10 device, is to check and ensure that taskbar thumbnail preview is enabled. If this isn’t the case, you can try the next solution.

2] Run SFC scan

If you have system file errors or corruption, you may encounter this issue. System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files. Run it and see.

3] Modify Windows Registry

This is a two-step fix which involves deleting the DisablePreviewDesktop registry key and then change the NumThumbnails registry key value.

Since this is a registry operation, it is recommended that you back up the registry or create a system restore point as necessary precautionary measures. Once done, you can proceed as follows:

Delete DisablePreviewDesktop registry key

• Press Windows key + R to invoke the Run dialog.
• In the Run dialog box, type regedit and hit Enter to open Registry Editor.
• Navigate or jump to the registry key path below:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced

• At the location, in the right pane, right-click on the DisablePreviewDesktop registry key

Note: Depending on your version of Windows 10, you may see DisablePreviewWindow entry instead.

• Select Delete.
• Click Yes on the confirmation prompt.

Change NumThumbnails registry key value

• Now, navigate or jump to the registry key path below:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Taskband

• At the location, on the right pane, right-click the NumThumbnails entry to edit its properties.

If the key is not present, right-click on the blank space on the right pane and then select New > DWORD (32-bit) Value to create the registry key and then rename the key as NumThumbnails and hit Enter.

• Double-click the new key.
• In the properties dialog, set the Value data to 10 in Hexadecimal base or 16 in Decimal base.
• Click OK or hit Enter to save the change.
• Exit Registry Editor.
• Restart your PC.

On boot check if the issue is resolved. If not continue with the next solution.

Related: Make Taskbar Thumbnail Previews appear faster.

4] Perform System Restore

If the Taskbar thumbnail preview was working well earlier, it’s likely your system has undergone some background changes that you are are not aware of that is now interfering with the proper functioning of the Taskbar thumbnail preview. In this case, you can restore your system to an earlier point when the system was working correctly.

Any of these solutions should work for you!

Related post: Make Taskbar Thumbnail Preview size bigger.

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