As with badr0b0t, I googled several options and selected Classic Shell, as it seemed the better of the free options, so it went in that day.
If you scan with your Antivirus daily, AdwCleaner (just once), MBAM (on a regular basis) and other tools, I have not found, what I would call an Infection. I only ever use the Classic Shell interface and the other stuff if I "must".
Gee, I installed IncrediMail 2 when helping another person with their install, and the PUPs / Minor items, were easy to remove in about a day of dedicated work (I am not saying to install this extra)... 99% of these free programs will install without problem once you do your basic computer set-up.
1/ Antivirus (usually something pre installed) 2/ Antimalware (MBAM or a similar program) 3/ Just take care (a lot of new garbage out there) and away you go.
4/ Am I Infected if you do hit the wrong buttons, and we can help there, so - - Just take care - - -