Thank you for taking time to read my post. I have an older HP computer running windows XP version 2002 service pack 3. I have Norton security suite through my ISP (comcast) on the computer. I first noticed I was repeatidly getting a notifcation from Norton that "Norton blocked an attack by :system infected:Tronjan.cryptolocker.L Activity". The notification just comes about every 2 seconds, the computer moves very slowly. I run a full system scan, which is now taking about 20 hours. I am told Norton finds about 8 problems. Fixes 5 and tells me to install and run "norton power eraser" for removal of the others. I installed and ran power eraser, but when my computer restarts I get the ransom notes and Norton still continues to notify me every 2 seconds it is blocking the trojan.cryptolocker. I also get a notification from Norton that two "Boot.cidox" viruses cannot be removed, And to rescan again. Which only runs me in the same circles. I uninstalled Norton, And installed Malwarebytes at the recommendation of a friend that is in IT and also tried Ad-Aware, Before re installing Norton again. Any help would be greatly appreciated, Again, Thank you for your time.