I have always used Norton Antivirus and the one year I tried a different brand, I regretted it. I have never had a problem with Norton Antivurus.
It is super easy to upload. Uninstall your old antivirus program and then upload put in the disk and follow the prompts to upload Norton Antivirus to your computer. Since you are following prompts you should have no problems at all installing the progarm.
Norton Antivirus will scan all your drives on your computer and you can even set the program to scan at certain times. It will detect and remove any spyware or viruses the program detects. You also get updates that will upload automatically. It prevents infected emails from coming through and infecting your computer. Once you download the live updates are good for one year, therefore you do have to renew or purchase annually. However it is highly recommended if it will save your computer.