Windows Minimum System Requirement

Windows 7 Operating System (32 bit or 64 bit)

Processor requirement         : 1 gigahertz (GHz) 
RAM Requirement                 : 1 gigabyte
Hard Drive Requirement       : 16 GB

Windows 8 Operating System (32 Bit):

Processor requirement         : 1 gigahertz (GHz) 
RAM Requirement                 : 1 gigabyte
Hard Drive Requirement       : 16 GB

Windows 8 Operating System (64 Bit):

Processor requirement         : 1 gigahertz (GHz) 
RAM Requirement                 : 2 gigabyte
Hard Drive Requirement       : 20 GB

Windows 10 Operating System (32 Bit):

Processor requirement        : 1 gigahertz (GHz) 
RAM Requirement                : 2 gigabyte
Hard Drive Requirement      : 16 GB

Windows 10 Operating System (64 Bit):

Processor requirement         : 1 gigahertz (GHz) 
RAM Requirement                 : 2 gigabyte
Hard Drive Requirement       : 20 GB

FYI: Please note above requirement is just the requirement which will start and run operating systems. But you can’t expect anything in the performance.

How to add user to admin group? Or How to give administrator right to user?

Step: 1 Click start button
Step: 2 type run and then press enter
Step: 3 type compmgmt.msc command and then press enter
Step: 4 locate Local Users and Groups and then select Groups
Step: 5 Now locate the Administrator group on right hand side
Step: 6 Right click the group and select properties option
Step: 7 Now select Member of tab and click on Add button
Step: 8 Please enter the username which you want to give the admin rights
Step: 4 click on Check Names and then select OK

FYI: You may need to log off and login again to take effect. 

How to enable built in administrator account?

Step: 1 Click start button
Step: 2 type run and then press enter
Step: 3 type compmgmt.msc command and then press enter
Step: 4 locate Local Users and Groups and then select Users
Step: 5 locate the Built-in Administrator account
Step: 6 do right click and select Properties
Step: 7 uncheck the check box Account is disabled and the click OK

How to enable the built-in administrator account for Windows XP, Windows 7, and Windows 8 & Windows 10?

You can follow the same step for above operating systems as well.

Why Administrator Account was disabled by Microsoft?

By default windows built-in administrator account was disabled by Microsoft for some security 
purpose and we need to enable the account for our safety purpose