You have most likely acquired some malware that Norton did not catch (this is not just a problem with Norton, but with all virus products). Go to www.malwarebytes.org and download the latest free version. If your malware is particularly nasty, it will block this site in which case you'll have to download the software on another computer and put it on a USB drive or CD. Boot your computer into safe mode (hit F8 repeatedly upon turning on your computer until the boot menu comes up) and select Safe Mode with Networking. Once in safe mode, install and run the MalwareBytes program. Let it update (if it can) and run a full scan (will take some time). After it completes, have it remove all infected files. Now reboot the computer and let it start normally. Run a complete scan with Norton and it should start updating again with no problems.
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