360 won't respond

Hi,

Not sure what's needed for help but problem is I can't open 360 or get any response from it.  This is the second time it's happened. Last time I did a system restore and it corrected the problem.  Both times it's happened is after my system does the microsoft automatic update.  Not sure what's being updated.

Running Norton 360 - on windows XP

Can anyone help and walk me through getting what you need?  As time goes by what I know about computers becomes less and less. lol