What is the most reliable and thorough Disk clean-up program in Windows Security Posted September 27, 2018 · Report reply I have been running Windows 10 (upgraded from Windows 8.1) for over a year on my 2-year-old Asus laptop with 500 GB hard drive and 8 GB of memory. Nevertheless it has lost its shine and speed. Windows bootup time, powering down, opening and using programs have gotten slower, which I've come to expect in time with usage. I'm not a very technical person and I have left all the Windows 10 settings alone as I'm afraid of messing something up. Oh, I did change my desktop background image, but that's about it. I run the free version of Avast antivirus and I'm mindful about security risks. My laptop runs okay, however I would love for it to chug along a bit faster. There are lots of programs for "cleaning up" a hard disc to restore computer performance. What do forum members think is the most reliable and thorough one on the market, and which ones should be avoided at all cost?