Which versions of CCleaner work with Windows XP or Vista?

Using CCleaner for Windows on XP or Vista:

If you are on Windows XP or Vista, you can use CCleaner version 5.64. Please download our slim build here.

Note: We only update this version with critical security updates.

XP and Vista and the increased risk of online threats: 

Like Microsoft, we recommend retiring your Windows XP/Vista computer and upgrading to a new one. This is especially true if your computer is connected to the internet because XP and Vista are no longer receiving security updates and are vulnerable to online threats.

This information from Microsoft can also help you:

Home users of Windows XP

Home users of Windows Vista

Business users of Windows XP