Get administrative priviliges in Windows operating systems

open command prompt
type "regedit" and press enter
Go to file and make a copy of your registry
Now navigate to:

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon \ SpecialAccounts \ UserList
Use the File, Export option to backup the key
Create a new DWORD Value named Administrator
Double-click Administrator, and set 1 as its data
Exit the Registry Editor.

Now you have administrative priviliges.