I used Advanced System Care for a while but turns out it conflicts with Steam...and eventually causes Steam to stop working. It is even listed on Steam's site in the "non-compatible" programs list. I don't know if ASC 4 made any changes concerning that though. Scared to try again...other than that...it works great for a free program and I recommend it.
Been using it with Steam on a new HD I installed Nater for a couple of months now and so far no issues. I have it set to manual start up and not automatic when booting into windows on that HD