Problems with NIS 2009 not opening.

I noticed today that my nortons won’t open for anything. I can’t open it all and I have nothing to my computer over the past few days to cause this. I think it’s now affecting my computer because firefox does not connect to the internet, and some of my games will not connect. If anyone knows how to reinstall NIS please tell me. I still have my code from purchase so that isn’t a problem. By the way I’m running vista home premium.