Ok, this what i recommend.
Mban from malwarebytes. it is really good and cleaning catching them
you can get the freeware version, which you have to manually run when desired, or buy for something like $25.00 then it monitors realtime.
The other util is more for cleaning registry and IE files etc etc
is cclean
http://www.piriform.com/ccleaner.
I work in IT. so can vouch for these, win8.1 cant have MSsecurity essentials as it already has its own inbuilt version. but that is good for win7 users in combo with above. best protection, other than don't goto sus sights