Norton (and McAfee) applications are
notorious for not upgrading (or uninstalling) cleanly.
1. Download the Norton Removal Tool, saving it to your desktop:
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ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe2. Close any open applications (i.e., anything with an icon on the taskbar).
3. After making certain you have a copy of your Product Key handy, uninstall all Norton software (including LiveUpdate and any Norton Add-ons) via Control Panel | Programs | Uninstall a program (or Control Panel | Programs and Features, if using Classic view).
4. IMPORTANT! => Enable the Windows Firewall immediately after rebooting.
NB: You're 'working without a net' now: Don't to ANYTHING else online (e.g., browsing; reading email; chatting) until you've completed Step #7 below!
5. Right-click on the file you saved in Step #1 above and select Run as Administrator. Don't TOUCH your keyboard until the run completes, then reboot.
6. Do a clean install of N360 2010 (V4) using your Product ID & reboot: http://www.symantec.com/norton/support/kb/web_view.jsp?wv_type=public_web&docurl=20080514162318EN
NOTE: Do not enable or install any Norton Add-ons (e.g., Norton Anti-Phishing) just yet!
7. Manually and repeatedly run (Norton) LiveUpdate until you get a 'no more updates' prompt.
8a. Reset IE8 now: http://windows.microsoft.com/en-US/windows7/Reset-Internet-Explorer-settings
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8b. For good measure, also reset Windows Update per...
How do I reset Windows Update components?
[Ignore the APPLIES TO section; Access KB971058 via IE8 32-bit only; Run the Fix It in DEFAULT and AGGRESSIVE modes]
http://support.microsoft.com/kb/971058
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9. Reboot one last time & test.