I struggled for 5 days trying to install Norton Security Deluxe on my desktop. Installed and uninstalled about 10 times using NSDownloader.exe and Norton_Removal_Tool.exe, following all instructions from Norton. Every time I installed Norton Security it would get as far a "Communicating with the Norton Server" then sit there with no connection or progress. Called Norton Support Desk for help but all they suggested was taking over my PC to search for problems. Of course they found some and recommended a Norton Tech Support clean my PC for a price - quoted about $450. This is new, out of the box software and expected the fix to be free. I closed out Tech Support and looked elsewhere for repair ideas. Found a reference to residual Norton files being left on hard drive even after using Norton_Removal_Tool.exe. I used "Search Everything" (freeware) and searched for "Norton". Found several folders that held Norton files. Most significant was a directory with files in C:/ProgramData and an old Norton 360 directory I installed several years ago, plus a couple of other directories. I deleted everything in these Norton directories and Norton Security Deluxe installed without a hitch. It is apparent Norton_Removal_Tool does not remove all old Norton products and these interfere with new installations. Saved $450.