For a long time CCleaner has been the most popular system-cleaning tool for Windows, extending its reach to other platforms like macOS and Android phones. However since security giant Avast acquired it last year, it's been a stormy ride that's had many doubting how effective or trustworthy the tool really is.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips