Window updates show SP1 install successful, but computer properties does not show SP1 installation. I am not able to install Norton and other softwares,
Welcome to Vista Forums rajkash. It is very common that SP1 does not install properly via Windows Update. The first thing you need is a modern browser that is supported by the Microsoft website and online installers. I strongly suggest that you install Mozilla Firefox. Then download SP1 from here: https://www.microsoft.com/en-us/download/details.aspx?id=30.
Many software products require SP2, and some no longer support Vista at all. If you restored from a factory image that included a free trial of Norton, then you should download and run Norton Removal Tool. Good luck!