I am having the same problem. On my desktop the full scan works fine, about 45 minutes. On one of my laptops it takes almost 5 hours to complete. On my other laptop, it's been running for over 2 days and still has not completed. All 3 computers have i7 processors and are very fast in all other operations. I replaced my old Norton software, Norton Internet Security, which worked just fine, with this software, Norton Security with Backup. If I can't get this to work, I'll be asking for a refund and switch to another security suite.