A simple Internet protection question?

[etc]

Hi,

I have a very important question to ask everybody.
If we are going on a free wireless internet,how will we protect our data?
So that Adminstrators and other people can not invade our computer system
to steal and destroy our all data?

Whether does the Norton Internet Security software be useful or not?
What do we need to set in our system.Thank you.

 

[A.Anand Srinivasan]

accessing of data needs certain clearance.... the system isnt going to give access to other resources in the system to the internet service provider unless u explicitly set it so... when a program or the network tries to violate this the system software itself restricts the access also antivirus software like norton find that any loophole is exploited and block those attempts....