Don't have anything running windows anymore
On the old pc stuff, always just used Microsoft Security Essentials with Superantispyware and Malwarebytes........always seemed to do the trick and all for free... tried most of the usual anti-virus programs and the free stuff seems just as good at the job you want it for but also less labour intensive...
Just got rid of some malware type rubbish on sister in laws laptop which was running a paid up version of Norton!

now running the three above with Norton all removed