ok... so explain to me why I shouldn't be worried about rootkits? Do we know there aren't any...or am I taking a chance here?
You should be worried and no we do not know for certain there aren't any.
All we can say with any certainty is that your scans are now clean.
There are people who will tell you that, once a rootkit has been on your machine, you can never trust it again - that is probably a decent assessment.
The only 100% solution to rootkits (and malware in general) is to wipe your hard disc and re-install Windows.
If you really want to dig further, you could try Root Repeal or F-secure's Blacklight. Those are good tools and I'm sure Judy has recommendations as well.
I would try Blacklight and/or Root Repeal....
PP :)