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Before deleting the registry keys in the Windows Registry, keep in mind that  making any changes to the registry keys can be very complicated and highly risky.
Warning: Please do NOT try this unless you are absolutely positive that you might mess up the system, and, as always, it highly recommended that you do a backup of the registry (or whole system) before making any modifications.
Here are the most common steps you might ever need to know for basic troubleshooting:
DELETING THE REGISTRY KEY IN WINDOWS 7:
Step 1. Click Start.
Step 2. Type “regedit” in Search Programs and Files section.
Step 3. Click “Enter.”
Step 4. When you see the message “Do you want to allow the following program to make changes on this computer?“, click “Yes.”
Step 5. You are redirected to the Windows Registry.
You can easily navigate through the subkeys if you know what you are looking for.
In case, you want to find the particular key, press "Ctrl + F" to locate the subkey that contains the value you want to edit. (Click F3 to find next)
Step 6. To delete a registry key, right-click your mouse, and select “Delete.”
Example: I will provide you an example how to delete the registry key I have created. It is called “example.”
Take the following steps:
Step 1. Click Start.
Step 2. Type “regedit” in Search Programs and Files section.
Step 3. Click “Enter.”
Step 4. When you see the message “Do you want to allow the following program to make changes on this computer?“, click “Yes.”
Step 5. You are redirected to the Windows Registry.
Step 6. Now search for a particular place in the Windows Registry:
HKEY_CURRENT_USER -> Control Panel -> Desktop -> Windows Metrics
Step 7. Find the key “example.”
Step 8. Right-click the mouse and select “Delete” option.
Keep in mind that deleting registry keys in the Windows Registry can be extremely dangerous.
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