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Integrating CCleaner into a custom Windows ISO using nLite (primarily for legacy operating systems like Windows XP, 2000, or Server 2003) allows the software to install automatically alongside your operating system.

You can accomplish this by using either an nLite Add-on Pack or by utilizing OEM folders for a silent switch installation. Method 1: The nLite Add-on Method (Recommended)

This is the cleanest approach because it compresses the application into a .cab or .7z file that nLite natively integrates into the Windows installation routine.

Download a CCleaner Add-on: Visit trusted legacy customization forums (like WinCert or MSFN) to find a pre-made CCleaner nLite addon pack. Alternatively, use an application like nLite Addon Maker to wrap the official CCleaner Offline Installer into an addon.

Launch nLite: Load your extracted Windows installation source folder.

Select Tasks: On the Task Selection screen, click and highlight Hotfixes, Add-ons and Update Packs, then click Next.

Insert the Add-on: Click Insert, browse to your downloaded CCleaner add-on file (.cab or .7z), and select it.

Process the Image: Proceed through the rest of the nLite wizard to compile your changes and generate your new, bootable Windows ISO. Method 2: The OEM Folder and Silent Command Method

If you cannot find a pre-compiled add-on, you can instruct Windows Setup to run the installer silently in the background right after login.

Obtain the Installer: Download the official CCleaner Offline Installer. Rename it to something simple like ccsetup.exe.

Create the OEM Directory: Inside your extracted Windows ISO folder, build the following file hierarchy:[Your Windows ISO Folder]\\(OEM\)\\(1\Install\</code><em>(Note: <code>\)1 maps directly to the root of the target C:</code> drive during installation).