There are 2 methods to uninstall SP1 Beta:

• Using Control Panel
• Using Command Prompt

Method 1: Using Control Panel

1. Open Control Panel and click on "Programs -> Uninstall a program" if you are using "Category" view.

If you are using "Icons" view, click on "Programs and Features" icon.

2. Now click on "View installed updates" link given in left sidebar.

3. Select the "Service Pack for Microsoft Windows (KB976932)" item in the given list and click on "Uninstall" button in the toolbar. You can also right-click on the update and select "Uninstall" option.

4. It'll ask for confirmation, click on "Yes" button.

That's it. It'll take some time and will uninstall SP1 Beta from your system.

Method 2: Using Command Prompt

1. Click on “Start button -> All Programs -> Accessories“. Right-click on “Command Prompt” and select “Run As Administrator“. If you are prompted to enter password, enter the password and continue. You can also open Command Prompt in Administrator mode by typing “cmd” in Startmenu Search box and press “Ctrl+Shift+Enter“.

2. Now provide following command and press Enter:

wusa.exe /uninstall /kb:976932

3. It'll ask for confirmation, click on "Yes" button.

That's it. It'll take some time and will uninstall SP1 Beta from your system.