Any good registry cleaner available for Windows 11/10?

If there were too many registry leftovers, then it is a good approach to clear the registry with a dedicated cleaner app.

In fact, before using any third-party cleanup tools, it's usually more effective and safer to use the tools that come with Windows to clean up the actual files that are causing the registry to bloat.

Free Registry Cleaner for Windows 10 and Windows 11：

Method 1: Use Disk Cleanup 

• Press Win + R to open the Run window, type cleanmgr and press Enter. 
• Select the system home disk in the pop-up window and click OK.
• Check the All Files category and click OK to delete the selected files.
• This will remove the redundant data that often creates associated registry entries.

Method 2: Use System File Checker 

• to search for cmd, right-click on Command Prompt and select Run as administrator.
• Type sfc /scannow in the command window and press Enter. 
• utility will automatically scan and repair corrupted Windows system files.

Doing what I did will solve the underlying problem more thoroughly than just cleaning the registry.

It's important to emphasize that Windows itself does not recommend registry cleaning, and most "registry cleaners"—especially third-party ones—can cause more harm than good. If you want a safe ways to clean or optimize your registry.

1. Manual Registry Cleanup via Built-in Tools

• Use Registry Editor:
      Back up the registry first (File > Export).
      Use Ctrl + F to search for specific keys or values.
      Remove entries related to uninstalled programs or known obsolete keys.

Tip: Focus on user-specific or leftover entries from uninstalled software.

2. Using PowerSha1l Scripts

• PowerSha1l can be used to automate cleanup tasks:
• For example, scripting to remove leftover keys or invalid entries.
  Example:

Remove-Item -Path "HKCU:\Software\UnwantedApp" -Recurse

You can write scripts to target specific known obsolete keys.

Always back up the registry before making changes, focus on manual cleanup rather than automated cleaning tools. Avoid registry cleaners that promise to "speed up" your PC—often they do more harm than good.

Using a registry cleaner on your Windows computer can seem like a quick way to improve performance, but it comes with significant risks. When cleaning up or editing the Windows Registry, it’s crucial to proceed carefully, as mistakes can cause system instability or even prevent Windows from booting.

Removing essential system or application keys, leading to system instability or application failures. Only delete registry entries when you're sure they are unnecessary or malicious. When in doubt, research each key/value first. By the way, Microsoft does not recommend registry cleaners; manual cleanup or cautious editing is safer. Double-check every change before applying. Use the correct data types (e.g., REG_SZ, REG_DWORD), and restart your system after registry modifications to ensure changes take effect.

B1eachBit is indeed a free and open-source registry cleaner that can help with various cleaning tasks on Windows 11, including clearing cache, temporary files, and some registry entries. 

B1eachBit for Registry Cleaning:
Functionality: B1eachBit can clean certain obsolete or invalid registry entries, but it is not specifically designed as a comprehensive registry cleaner.
Safety: It's generally safe, especially since it's open-source and well-maintained, but as with all registry cleaning tools, caution is advised.
Ease of Use: Its interface is straightforward, but it might not provide as detailed or targeted registry cleaning options as specialized tools.

While B1eachBit is a good tool for general cleaning and privacy protection, for dedicated registry cleaning, I recommend a specialized registry cleaner. If you decide to try B1eachBit, do so cautiously and ensure you review what it plans to clean before proceeding.

Unfortunately, both Windows 11 and Windows 10 don't have a built-in registry cleaner tool. 

A registry cleaner is a type of utility software designed for Windows systems that scans the Windows Registry for entries it considers unnecessary, invalid, or corrupted, and then attempts to remove or fix them.

What does a registry cleaner do?

1. Scans for Invalid or Orphaned Entries

Over time, when you install or uninstall programs, the registry may retain leftover entries such as file paths, program references, or settings that no longer point to valid files.

Registry cleaners search for these "orphaned" or "invalid" entries.

2. Removes Redundant Data

They delete old references to uninstalled software, missing DLLs, or unused file extensions.

The goal is to reduce clutter in the registry.

3. Attempts to Improve Performance

A smaller, cleaner registry may theoretically improve boot times or overall responsiveness, although on modern Windows versions (10 and 11), the effect is often minimal.

Most noticeable benefits are often psychological (“tidiness”) rather than measurable speed boosts.

4. Fixes Certain Errors

Registry corruption or broken entries can sometimes cause errors, like missing context menus, application crashes, or issues with startup programs.

A registry cleaner might repair or remove these problematic keys.

You can follow the above standard to find the best free registry cleaner for Windows 11 and Windows 10.