How to open explore the drives if it not opens?

Hello friends,
I am having a big trouble with my PC. My drives are not opening from the My Computer menu. When I double clicked on the drives, suddenly a note comes out saying that:
“THE OPERATION HAS BEEN cancelled DUE TO RESTRICTIONS IN EFFECT ON THIS COMPUTER. PLEASE CONTACT YOUR SYSTEM ADMINISTRATOR”
Nobody touches my PC as far I know. And I am the only user of this PC. So, who will be my system administration?
I think it’s totally a wrong note which is showing at the time of double clicking on the drives. What will be the solution to open my drives? None of the drives are open and not showing a different note. I tried to open the drives in many ways. Such as – Clicking on the explore button after right clicking on the drives, with the help of run menu, etc.
I want help in this regard.
Anybody please help me to open my drives.
Thank you.
