sends this report from Martin Brinkmann of gHacks: Microsoft's Windows 10 operating system may uninstall programs — desktop programs that is — from the computer after installation of the big Fall update that the company released earlier this month. I noticed the issue on one PC that I upgraded to Windows 10 Version 1511 but not on other machines. The affected PC had Speccy, a hardware information program, installed and Windows 10 notified me after the upgrade that the software had been removed from the system because of incompatibilities. There was no indication beforehand that something like this would happen, and what made this rather puzzling was the fact that a newly downloaded copy of Speccy would install and run fine on the upgraded system.
An IT Director I know had this happen with ESET antivirus as well, on multiple computers. He says fixes have been rolled out for both TH2 and the antivirus software to prevent this from happening. Other reports mention CPU-Z, AMD's Catalyst Control Center, and CPUID as software that's being automatically uninstalled.