Clutter and Bloating - This can be a real struggle if you have teenagers. Essentially, you want to keep all non-essentials off your computer. Do not download any program that says it wants to help you, and no toolbars, no "helping" programs (remember, your life was just fine without them). I would avoid weather apps too. Watch out for games similar to solitaire. That kind of stuff can have extras. Be particularly wary of programs that tell you they will make your computer faster. They almost always come with some sort of hidden crap and viruses.
Same goes for MY CLEAN PC or any TV advertised simple solution - that is a national TV campaign of bogusness. Avoid any national remote-based (they remotely take over your computer), one-size-fits-all tech support plan fiascos. I have never heard of one that isn't horrible. Stick with a reputable local support person.
I recommend one program only to clean off temp files and debris. CCleaner, and it is free. Learn to use this and the add/remove programs part of your Control Panel and your computer will be much happier. NEVER GIVE OUT YOUR CREDIT CARD INFO AT THE REQUEST OF ANY NON-HUMAN, unless you are absolutely sure you know and trust the webpage or program, i.e., the anti-virus program YOU KNOW you voluntarily installed on your computer. In general, the more adds on a page, the more likely you are to bump into a malware popup. It’s probably not a bad idea to install a free adblocker for your browsers. I use one from a site called Getablock.com.
A happy computer needs only one program installed to help protect it and keep it clean: one good antivirus program. That's it. And CCleaner too if you want. That's OK.