Thank you for answering my question
Neosploit is a high end, actively developed exploit kit that is used to penetrate your machine. It is often used -- though not always -- to steal credentials (in other words, the username and password of places you access).
The message indicates that Norton found and blocked an attempt to load Neosploit onto your machine.
There is nothing you need to do as Norton protected you. It would be like if some thief checked your door, found it locked, and moved into another house.