You may try to boot windows into advanced startup troubleshooting & recovery mode. Either by windows installation disc or USB or just restarting the computer a few times while at the windows loading screen.
Troubleshoot > Command Prompt will open a console for you.
You can either add your user to the Administrators group or create a new user with admin privileges (if that software changes it every time).
First, check your exact Username with:
net user
Then add it to the Administrators group:
net localgroup Administrators yourusername /add
Create backup admin user:
net user yourusername password /add
net localgroup Administrator yourusername /add
I hope it works for you.