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Computer running slow after installing Norton
Dell Inspiron, Windows 7, Norton Internet Security, Mal-Warebytes. Computer stays off Internet except when I temporarily need to surf/read emails. Unable to update to 10 because the CPUs stay full. This computer ran flawlessly for several years until Norton changed its software to only scan while online.
Originally, I did everything to remove all viruses and malware. The computer was super slow and would freeze if I tried to open any program (offline). The CPU usage graph shows nothing unusual running, only the minimal system usage.
This all started with Norton not downloading its updates.
Over several months, the computer was scanned and rescanned in all user accounts as well as safe mode (online and offline). Nothing helped. In safe mode, the computer ran more quickly suggesting the issue only runs in regular mode.
My IT guy thought the memory might be bad and replaced/upgraded the memory to try and increase speed. No help.
Eventually I used a system image to restore the computer. It ran like a top... UNTIL I reinstalled Norton.
The computer had been offline until I downloaded Norton and started the initial scan. Now it's back to the exact same condition.
I would like to wipe it but am not able to aquire a system disc. Plus, if I try to reinstall Office, I was told that I have to uninstall it online on order to reinstall it because the limited number of uses has been filled. Not sure if I have all the other program discs.