I've finished working on two small Dell computers just this evening. Both are Windows 7 Pro. After getting ALL the available updates from Microsoft, I used a script to uninstall those updates related to pushing Windows 10 and telemetry. The first one I did this to was a brand spankin' new Dell Optiplex (don't recall model number, they all look alike ) SFF. The uninstalls seem to go without issue but after rebooting the CBS.log file was 3.3GB in size. WTH!!? The other was an older Optiplex 780 SFF and its CBS.log only grew to about 800MB. I attempted to delete both of them with the same immediate result. Both were in use by Trusted Installer and neither would allow deletion. So I killed Trusted Installer and immediately deleted those CBS.log files. I replaced the with two new files made in Notepad and they both functioned normally afterward. One stayed at 1KB in size while the other grew to 10KB. I have never before seen anything like this. Any ideas as to what was going on? I've a paranoid theory of my own but can't prove any of it.