For speeding up a PC
Ashampoo WinOptimizer 15 is a great choice if you’ve never used a system optimization tool—software that speeds up PCs by deleting its junk files. “Designed with accessibility in mind,” the $10 program walks you through the cleanup process step-by-step.
Piriform CCleaner is an “incredibly thorough” alternative. The free version assumes you have some knowledge, but it’s “never overwhelming,” and it removes nothing important unless you direct it to.
Iolo System Mechanic lets you choose between a quick scan, which checks for common issues, or a “deep” scan, which may turn up loads of system detritus. The $70 annual license fee covers all PCs in your home.
IObit Advanced SystemCare offers a two-pronged approach to dealing with clutter and security threats. The $30-a-year version includes support for up to three PCs and protection from viruses, malware, and ransomware.