If you are on Windows XP or Vista, you can use CCleaner version 5.64.
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 or 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.