I reviewed TuneUp Utilities 2013 last year for Amazon, and found it to be excellent. A year later and I still have it running on my Toshiba laptop, which it maintains very nicely for me. The 2014 version adds a few extra features for Windows 8.1 support, and adds a convenient "Flight Mode" that switches off wireless and bluetooth when you are flying.
TuneUp is a large collection of utilities designed to fix many common problems, optimize Windows and applications, speed-up startup and shutdown, and generally keep the whole system tidy and efficient. The user interface is very easy to use, with plain-English captions and instructions throughout. I have had no problems with it at any time, though I may have just been a bit lucky with it. I installed TuneUp 2014 on an old dell Inspiron 1100 laptop that was in a lamentable state. It took about a day to work through all the utilities, but by the end of the day, I had a much quicker laptop, cleaned of all junk, and ready for use.
It only crashed once, when it had finished optimizing the system registry, but TuneUp 2013 also crashed doing the same thing. Even so, it had finished its work by then, so no real problem.
This is one of the few bits of utility software that I would actually bother to buy. It sits in the background, quietly switching apps on and off as needed, thus reducing system overhead. after a year of using TuneUp 2013 without a hitch, a see no reason why TuneUp 2014 won't do the same.