From your setup:
Good luck. You will need it.
Not having real time protection and sharing the PC with family members is literally the best way to get 500 fresh samples of PUPs and adwares.
It’s even grossly negligent.
You know, not everybody is a click-happy user. Some have common sense, and I told them to not click on/run any unusual thing without my permission.
fixed that now"Other users: Other accounts are Admin users"
It seems that other users use other (non-SUA) accounts. So, the SUA account is less safe than usual.