0x80070643 is the ever-not-so-helpful “install failure” code. The Windows Essentials installer is ridiculously complex with a huge set of multiple installers running in parallel and other crazy tricks.
The installation log will be very useful here. Reviver will prompt you to open the folder of the log files after the installation fails, or you can simply get there yourself by pressing the R (Windows Key-R) to bring up the Run box, then copy and paste the following text and choose the OK button.
The newest log is what you’re after. I’m unsure if you’ll be able to paste what is probably a big text file here, feel free to email it to my firstname.lastname@example.org email instead if you have trouble.
Also I’d highly suggest you use System Restore in Windows to restore to a restore point before the CCleaner/registry deletion attempts. In my past experiences and just on how the Microsoft Installer software works, this brute force method has made it increasingly time consuming to debugging install issues with the Essentials installer.