I have Windows 98 and Windows XP Pro installed on my computer. Whenever I log onto Windows XP the NTAuthoritySystem Shutdown window comes up and shuts down the computer in less than a minute. It happens so fast so I have no time for a system restore or anything else. This happened a few times in the past, but after restarting there was no problem. Now it comes up every time I log onto Windows XP. My Windows 98 is running fine.
First, setup Internet Connection Firewall on your Windows XP computer. That will stop your computer from rebooting while you fix the source of the problem: http://www.microsoft.com/windowsxp/expertzone/columns/northrup/02august12.asp.
Then, install anti-virus software on your computer. When you have a few minutes, you can read this: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-026.asp
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