System update and lost system time and background

I was asked to performed a system update with a reboot which I proceeded to do. Once the reboot was complete I had lost my system time (which had been reset to December 31, 2000 and my background had been replaced with the original generic MAC background. I have been unable to find the source of this issue and I am unsure how to fix this. I was able to change my clock by adjusting the Date & Time Preferences and fix my background image as well, but I am concerned that this is a temporary fix. Has anyone else experienced this with a system update?

 

Unknown

I am not certain what updates were installed. I walked away while I had a message that stated "Please wait while disk space is found" or something like that.