Surely I assume its Windows 8.1 Enterprise version?
UAC turned on? You mean Adblock Plus? You may go to the alternatives like Adguard extension or Ublock + followed by HTTPS Everywhere.
Backup? You may create system image and bootable recovery device in case of any problems occur.
No harm to add another on demand scanner like MBAM for security scan once a week.
Overall very fine and simplified configuration,