nis 2011 will not allow me access to the internet after a system restore.

Please help, I am useless at all this. My problem started yesterday when the blue error screen popped up for no apparent reason that i am aware of. I was prompted to do a system restore which i did and everything seemed fine until this morning when I topped up my dongle. T-Mobile took my money for 30 days and an error message appeared and asked me to redo my option but once i did this it does not show that I have made or paid for my 30 day option. I have contacted T-Mobile about this who say that it has all been accepted and tech support suggested that I uninstall norton which i am unable to do.ii even tried to reinstall via the installation disc and then uninstall but to no avail.