One thing that I have noticed.
If you run adaware or spybot after a week or so it comes up with a few things and takes care of them.
But if you run CCleaner first then adaware or spybot nothing is ever found.
Is ccleaner a better tool than both of these other ones?
They're different categories of tools.
Ccleaner is for cleaning up excess unwanted and unneeded files, including temporary files, internet cache etc. In so doing it will delete the cookies you have not set to be saved.
AdAware and Spybot specifically target malware. Trojans, worms, various exploits. AdAware isn't much good for finding anything except cookies anyway, if you've deleted them using Ccleaner there's your answer.
And if Spybot doesn't find anything, possibly it means you have mo malware on the computer.