Can I cleanup window registry errors files and invalid entries manually. When I do this manually then how?

To manually clean your registry using the Windows Registry Editor, first create a backup of the registry, and then remove unnecessary files:

• On the desktop, click the Start button on the left bottom corner
• Click Run
• A new window to "run" commands
• Type regedit
• Click OK
• At the top of the window click File
• Go down to Export
• Type a name for the backup file, and click Save

After creating a backup of your registry, you can go to the left side of the registry editor window and view how your computer is configured.

Click on the plus sign to expand a section of the registry editor. A "well-used" area for anyone manually deleting registry files is "HKEY_LOCAL_MACHINE." This area is used to make registry changes to hardware and software.

However, if you are not sure about what you are doing, I wouldn't recommend it. Try CCleaner.

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There are three ways by which you can clean up your registry. The first and the most conventional method of cleaning up the Windows registry is that of formatting up the hard disk of your computer and reloading the operating system. This is quite a time consuming and cumbersome job, not to say costly to boot if you end up buying software or hiring a third party to do it.

The second method of cleaning up your Windows registry is by using the regedit.exe command. You can manually delete all the errors from your registry by going through the registry entries in the registry window. This is also quite time consuming as well as risky. You might end up removing some crucial or important files, thus making your whole system unstable. Even Microsoft advises against tampering manually with the registry. So this is a job left better to registry experts.

The third and the best method of cleaning up your windows registry is by running a registry cleaning software through it. All you need to do to clean your registry is log online and download a good registry cleaner from the internet. Reg Cure, Reg Sweep, Error Nuker, Registry Easy, Registry Repair Pro and Reg Clean are some of the best registry cleaning programs that come highly recommended by experts. Once you have downloaded a registry cleaner, just install and run it. The program will automatically scan and repair all the errors in your registry, restoring it back to a mint perfect condition. This is the quickest and easiest method of getting your whole computer back to an almost new condition and increasing its speed. You can also run a registry defragmenter, which comes with most registry cleaning software, in order to further speed up your computer.