If your computer is set to classic view "start menu", go to "control Panel" and expand the "administrative tools". Otherwise, the management group is in the category of "Small icons" in the control Panel.
Double-click the node of the "computer Management" snap-in and expand the "Local users and groups". In the Name list in the right part of management console, expand the Users folder. Right-click the user account "Administrator" in context menu choose "Properties". Remove the flag next to "account is Disabled".
In the field "Full name" record not matching the name of the owner of the computer that you specified when installing an operating system. Click Apply and OK, restart the computer and login under the new account.
Management console you can invoke another method. Right click the mouse on the icon "My computer" invoke a drop-down menu and select "Manage". In the left part of the console snap-in, click "Local users and groups".
You can also disable the "user account Control" (UAC). In the "control Panel", expand the "user Accounts". Select "Change settings..." and adjust the slider to the bottom position. The system will treat any user as administrator.
There is another way. In the window, run programs, enter secpol.msc and right click on the icon to run the command. Tick "Run with administrator". Expand "Local policies" and "security Settings".
In the policy list, locate the "Accounts: state Administrator". Click on it right button, select "Properties" and switch the status to "Enable".
If your computer has Windows 7 Home Premium or Windows 7 Home Basic, from the start menu, click Run and the window of run program type cmd. Right click on the command prompt icon and select "Run as administrator".
Enter the code net user Administrator /active:yes. Confirm by pressing Enter, and restart your computer. Log on under administrator account.