1. Shutdown virus :

Cause:

In the past day or so, many users have experienced a problem with Windows 2000 and Windows XP computers automatically shutting down and giving a message that there is a problem with the LSASS, or Local Security Authority Service (or a file named lsass.exe).

Solution:

1. Save any work you have open, and close all programs.
2. Click Start, Settings, Control Panel, Add or Remove Programs.
3. Scroll to the bottom of the list where you will see “Hot Fixes”. Check to see if you have the “hot fix” needed to combat this worm: KB835732
4.If you do NOT have this fix installed, visit www.microsoft.com/technet/security/bulletin/MS04-011.mspx
5. Select the path for the operating system you are using (Windows 2000 or Windows XP).
6. Download the patch for your operating system.
7. Find your download, double click it and let it install.
8. Reboot your machine after the installation.