CCleaner works on Windows XP, Vista & Windows 7 Beta. It supports Internet Explorer, Firefox, Opera & Google Chrome browsers but this is not evident in the software as shown.
On their website, it is mentioned it can clean temporary files, history, cookies, download history and form history for Mozilla Firefox. This is less effective than Firefox 3 which can clean more items such as search history, offline website data, saved passwords and authenticated sessions. But, CCleaner also can clean applications such as Foxit Reader, Windows Media Player, Windows Defender, MS Paint and RegEdit.
It can be scheduled to run when the computer starts. After installation on a computer, you can just copy the installation directory to a USB flash drive and it will work on any computer.