Safe or sorry, your choice
How many times have you seen these words?
"This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs."
The Registry contains information that Windows continually references during operation, such as profiles for each user, the applications installed on the computer and the types of documents that each can create, property sheet settings for folders and application icons, what hardware exists on the system, and the ports that are being used
Here's the Microsoft support article to guide you through the process:
How to back up, edit, and restore the registry
How to backup the Windows Registry
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