Yes, it's recommended to uninstall all the other Norton versions before installing a new one, because it might create conflicts. In most of the cases:
-
The installer will refuse to continue until the old product is not removed.
-
Windows will run slow due to resource consumption. Norton is known to consume system resources, and if you install two similar products, then the performance will degrade slowly.
Note: Use the Norton Uninstall Tool to get rid of the current version installed on your computer.