Do you need to remove old Antivirus programs or other security software? First go to the Windows Control Panel and click on the menu item that will remove programs. It is usually labeled with the word "Programs" in the menu item. Next remove ANY antivirus and bot or spam software programs you have. (And any other useless software while you are there.)

Do you need to repair your registry? Most of these problems are caused by a corrupt Windows Registry on your computer. The Windows Registry keeps track of your computer's setup. It can become corrupted during a power failure, aborted install or similar event. You will be surprised how messed up the registry can get. It can easily be automatically fixed by many software programs. Google "Fix Windows Registry" for help.

Do you get a Windows Error when you try to install? If, when you attempt to run the program, you receive a message about the program not being a Win32 executable, or 'invalid', you have downloaded a bad copy. Please delete it and download it again.

It is usually not the Norotn software causing the problem, it is the fact the computer was already damaged and that causes install problems.  Find a local repair company to help you. Usually a Best Buy or similar chain have in store walk up service counters.