I did a series of Windows Updates to my machine (it was lagging behind a bit) and afterwards my user account seems to be always running with administrator rights. I first noticed when I ran cmd.exe and observed the "Administrator: " heading. Then I tried creating a file using windows explorer and the file will be owned by Administrator instead of my own account. I use Cygwin to examine the system and it is not able to delete files owned by Administrator as it's own privilege level will be set to my account.
I am on a domain, with local administrator rights to my own machine.
Googling the issue is difficult since everyone else seems to want to go the other way, from normal user to administrator.
What setting has changed to make this happen?