How to take the admin rights in windows 7 and windows 8 ????

I KNOW YOU WERE WAITING FOR THIS TIP....

You have to go to control panel then go to system and security and then go to action center and then change user account control setting. Now there you will see one control bar, what you have to do is that bring that bar to the bottom.

TASK IS OVER...

Now all the controls are in the users hand. Now the current user is the administrator of the system. 

What to do to know how many users are there who is using the system?

                Open the command prompt. And there you have to type “net user” and there you will be showed the total users of the computer.