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.
Then, install anti-virus software on your computer. When you have a few minutes, you can read this:
This was first published in February 2004