To optimize the PC and keep it clean from any bloatware or malware, i prefer doing it manually with some specific programs rather letting it all be automated, which can cause issues.
Programs that i use with my PC are;
Temperature monitoring
Speccy (nice GUI and easy to use + has sys tray temp monitor feature),
link:
https://www.ccleaner.com/speccy/download
HWinfo64 (a lot more detailed + has logging feature),
link:
https://www.hwinfo.com/download.php
Application monitoring
Process Explorer (to see which programs hog the system resources),
link:
https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
Guide on how to understand it,
link:
https://www.howtogeek.com/school/sysinternals-pro/lesson2/
Application fine-tuning
Autoruns (to configure which programs automatically start when PC boots into OS),
link:
https://docs.microsoft.com/en-us/sysinternals/downloads/autoruns
CCleaner (to clean your PC from temporary files, including registry cleaning),
link:
https://www.ccleaner.com/ccleaner/download
Malware protection
Malwarebytes (also protects during web browsing by blocking infected sites),
link:
https://www.malwarebytes.com/pricing/
Malwarebytes has 3 versions:
Standard (after 14 day trial has ended) - good for manual scans of your system
Trial (14 days free) - adds web browsing protection over Standard version
Premium (costs money) - adds real-time protection over Trial version
Web browser
Besides those stand-alone programs, i also use web browser plug-ins to protect my PC further. What i use are:
HTTPs Everywhere, link:
https://www.eff.org/https-everywhere
AdBlock Plus, link:
https://adblockplus.org/en/
NoScript, link:
https://noscript.net/
Out of all those programs, NoScript plug-in for mozilla-based browsers (e.g Firefox, Tor) is the single best piece of software that keeps my PC clean of any malware. NoScript automatically blocks all scripts running on all websites. Though, while it does break some websites from operating properly, with it, you also have an option to manually allow every single script to run. With it you'd have absolute control over each and every website and it's you who decides if the script on that website is safe to run or not.