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I've just upgraded a Windows Vista machine to Service Pack 1. Subsequently I upgraded the previously disabled Norton Internet Security 7 (expired) to Norton Internet Security 2012 (this requires SP1). On reboot, I get a consistent blue screen caused by SYMTDI.SYS that says DRIVER_UNLOADED_WITHOUT_CANCELLING_PENDING_OPERATIONS. How can I clear this up?

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See pchelpforum.com/windows-vista-7/… and symantec.com/connect/forums/… for similar issues –  David Fraser Mar 6 '12 at 16:08
    
You could/should have run the Norton Removal Tool - it often clears up errors caused by uninstalling Norton programs. Upgrading with a large version difference is essentially uninstalling and reinstalling. –  Bob Mar 6 '12 at 16:30
    
You really should install Service Pack 2 also. –  Ramhound Mar 6 '12 at 18:17

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I found SYMTDI.SYS in C:\Windows\System32\drivers by booting up in the restore mode, going to advanced system recovery options, and launching a command prompt. I renamed it to SYMTDI.BAK and rebooted successfully

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So, this may disable some functionality, but at least the system boots and seems to function OK –  David Fraser Mar 6 '12 at 16:21
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The file in question is Symantec’s device driver. There is an exploit in versions from 2005-2006 in a report I found from 2007. symantec.com/avcenter/security/Content/2007.07.11d.html You really should be using Visa Service Pack 2. Be sure you clean the previous installation out before trying install the new version of Norton/Symantec –  Ramhound Mar 6 '12 at 18:21

http://file.net/process/symtdi.sys.html apparently it crashes things on XP a lot, only one or two reports from vista. many people argue that its a part of Symantec or Norton. One guy says it crashes every dell he's tried it with. And they say malware sometimes uses the name. You can scan it at: https://www.virustotal.com/ assuming you can find and copy it. Bottom line seems to be (based on file.net reports) that switching to a different antivirus (Microsoft Security essentials Avast, AVG and ClamWin are some free options). If you can boot up in safe mode and uninstall Norton.?

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