I noticed that there is a service called OS Remediation System Service. It occasionally creates folders in temp with a random number as their names. They contain two files, osrss.dll and osrssupdate.exe (from what I remember, since i deleted these folders from temp). I wonder what this service is used for and if it is genuine or malware. It was created on February 1, 2018, which is the day I installed KB4056254. I do not know if another type of temp folder with reach.exe in it is relevant to this.
Windows 10 Home 64 bit (1703 build 15063.877)
AMD Radeon R9 270X
SanDisk SD7SB6S128G1122, 120 GB
Toshiba DT01ACA200, 2TB
16 GB ram, model unknown