Seriously? Google it. You don't know basic computer maintenance but advise people to edit the registry instead?
Ok, so tell us what those precautions are...! Editing the registry is always risky, and should only be done for specific and necessary changes. Your advice was wrong, unnecessary as well as dangerous.
Let's look at a typical Microsoft example:
This article is intended for advanced users, administrators, and IT Professionals.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
You obviously lack knowledge to give proper advice, I am seriously asking you to take a step back. It's not just wrong advice, but dangerous. Please just STOP with bad advice!