Lately I have been going out to repair slow & hung computers. Here are the tools I am currently sold on (as they have fixed all issues so far):
SuperAntiSpyware – Detect and Remove Spyware, Adware and Remove Malware, Trojans, Dialers, Worms, KeyLoggers, HiJackers, Parasites, Rootkits, Rogue Security Products and many other types of threats.
MalwareBytes – Malwarebytes has developed a variety of tools that can identify and remove malicious software from your computer. When your computer becomes infected, Malwarebytes can provide the needed assistance to remove the infection and restore the machine back to optimum performance.
CCleaner – The number-one tool for cleaning your Windows PC. It protects your privacy online and makes your computer faster and more secure. Easy to use and a small, fast download.
Each one of these apps are free and can seriously damage your system if used recklessly.