Good galerinha, as here on the site we are always launching Shells, themes and modifications in the operating system, I thought it would be helpful to have a reference guide teaching to create a restoration point. If any modification does not work on your Windows, you can restore the system files. Come on!
To create a restore point on Windows XP, follow the following steps:
• Click "Start -> Programs -> Accessories -> System Tools -> System Restoration";
• In the window that opens, click "Create a Restore Point" as in the image below, then click on go;

• After clicking on the next screen, you will see a box to enter a description of the restore point. I suggest you put a detailed description of the modification that will occur in the system, to better understand the point later, see the image below:

• After typing the Description, click on "Create";
• After that, the final screen will appear with the description of the restore point, click Close and done!

Your restoration point is created, any problem with the System you can restore it earlier. But remember to always create a Restore point whenever you are going to make some deep system modification, Windows file exchange, registry modifications among others.
All right then? For today it's just, sorry for the lack of update in the tutorial area, but it's just that I'm running out of time for myself. But soon everything will be back to normal, I'm preparing some more tutorials for you.
See you next time!