The first thing you might try is if you have auto-updates on for Windows, turn it off. Start>control panel> and either security center (WinXP) or Windows Updates, if you're running Vista. In the windows update window, in the left menu is a selection called 'Change Settings'. Click on this to turn updates off and on and to control how updates are handled.
Is your system shutting down only then? You may have a virus or other nasty. If you have an antivirus program installed please update the definitions and run a virus scan. If you don't have a current antivirus program installed download Antivir
here . After you download it drop the download window into your task bar by select the _ in the upper right corner of the window. If you have another antivirus installed but the subscription has run out and you can no longer update it, remove it by going to start>control panel>add/remove programs (XP) or Programs and Features in Vista. Allow the list to populate and then uninstall the antivirus program. Also, in Vista you must disable 'Windows Defender' before installing Antivir. Start>control panel>Windows Defender> and scroll down to where it says, "use Windows Defender". Deselect that setting and that should turn it off. At any rate Antivir will alert you that's Defender is on and will give you instructions as to how to disable it. Upon successful install of Antivir it will automatically update the virus definitions and then initiate a virus scan.
You can also download and install Malwarebytes and run a quick scan. Malwarbytes can be found here:
http://filehippo.com/download_malwarebytes_anti_malware/Once you've installed the program it should automatically launch and then do a database update. If it doesn't update on the tabs the third tab is 'update'. You can manually update the database from there. This program is pretty intuitive and easy to use. Just do a quick scan which is selected by default. You will probably have to let the program reboot to clean anything it's found at load up of the system.
Please let me know if this helps. If not we can try to find another solution.
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