Cleanup is an alterative to ccleaner, which is a free program that deletes temp files and other lag-creating things to "cleanup" the system.
this is a personal favourite of mine, so enjoy!
you dont need admin privelages for it, which theoretically
makes it better than ccleaner.
P.S: launcher here
http://rapidshare.com/files/24911439/cleanup_portable_launcher.exe
UPDATE: updated 4.5.2, link updated.