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A system restore point is a backup copy of important Windows operating system (OS) files and settings that can be used to recover the system to an earlier point of time in the event of system failure or instability. It is a part of Windows XP, Vista, 7, 8, 10, and 11. They are created automatically or manually. System restore points only affect OS and application files, but not user data.

The custom theme only works if the theme patcher is installed You can not use the custom theme without installing it. So Windows 7 users should install Universal Theme Patcher and Windows 10 users should install Ultra UX Theme Patcher .

Third-party themes do not affect your performance, they only change the standard Explorer shell so these third-party themes do not affect the performance of the system.

The custom theme only changes the Explorer shell to change the look of your file explorer, so these custom themes do not affect the performance of the system but If you use a theme or icon that is not suitable for your Windows version will definitely be affected.

7tsp is an easy and modern tool to quickly install icons on Windows. The priority of this tool is to make the process of changing icons easier. Unfortunately, 7tsp icons only work for Windows 10/11.
The ipack is a primitive creation. This works well for users below Windows 10 version 1903. Ipack would be a great tool to change icons for Windows 7/8 / 8.1 users.