Disable Administrator Login on Windows7 Welcome Screen

Here is the easiest way to disable the Administrator account login screen on Windows7 welcome screen. You have to make sure the current user has administrator access to run the dos command prompt. If you were having trouble fixing your computer's hosts file access denied issues due to the sypware or virus on your computer, you can find the answers here.

According to http://support.microsoft.com/kb/555910
To enable the build-in Administrator account, follow these steps:
1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt, and then click Run as Administrator.
3. When you are prompted by User Account Control, click Continue.
4. At the command prompt, type net user administrator /active:yes, and then press ENTER. 
5. Type net user administrator , and then press ENTER.
Note: Please replace the tag with your passwords which you want to set to administrator account.
6. Type exit, and then press ENTER.
7. Log off the current user account.

To revert do exactly the same thing but change
net user administrator /active:yes to
net user administrator /active:no