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Post back if you aren't sure if your CPU supports the SSE2 instruction set. What version number of Norton Security is currently installed on your computer (go to Help | About)? You didn't mention how far back your system was rolled back when you re-imaged your hard drive with Norton Ghost, but as far as I know Norton Security v22.15.x (the legacy version for Win XP and Vista computers that have a CPU that supports SSE2) has not been updated since v22.15.5.40 was released on 2 (see the release notes ).
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Do you have a subscription for the Standard, Deluxe or Premium version of Norton Security? If you aren't sure, log in to your Norton Account at to see your product name, expiry date of your subscription, the number of available installation seats, and current product activation key.
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