Q: When i try to install a norton product i have purchased i get the error "download already complete". Setup then fails.

A: This is caused by a corrupt download installer, there is a quick and easy solution.

Head over to Symantec auto tools, here you will find many auto fixes for norton issues.

http://www.symantec.com/autotools

Download and run the downloadclean executable.

You will now be able to restart the install of your norton product without failure.