5013 Error

Earlier this week I started to receive this error message.  Every time I start up the Norton screen pops up showing a 5013 Error.    In addition to this error, I started getting blocked Trojan.Gen2 messages and backdoor blockings.   They say no action needed,  threats blocked.   But I get these every 5 minutes or so.    I have had several "blue screen" crashes in the past week.      I have no idea what to do....     Do I have a virus or is something else happening.   Any suggestions?  Thanks.. SJH