Issue:
With newer versions of Windows OS, you no longer have the option to adjust what groups a user a member of (For example if you have Sophos installed, there would be a SophosAdministrator group). To change this, you can do this via command line.
Method:
1/ Find what groups there are on the system:
net localgroup
2/ Find what group a user belongs to:
net user userName
3/ Add a user to a group:
net localgroup group_name UserLoginName /add
example:
net localgroup SuperUserGroup Jason /add
Links:
http://www.windows-commandline.com/add-user-to-group-from-command-line/
http://www.windows-commandline.com/list-of-user-groups-command-line/