This is Mike from the Norton Authorized Support Team.
Your system could have an infection, a software conflict , or a hardware problem. Make sure that you are using Norton 360 2.0 and not 1.0. If your subscription is valid, you are entitled to a free update to Norton 360 version 2. To update, make note of your current activation key and (using Internet Explorer 5.5 or higher) visit the Norton Update Center.
Norton Update Center
If you are already using version 2, manually run LiveUpdate to make sure you have the latest definition and product patches applied, and then perform a "Comprehensive Scan" to check for infections.
Make sure that the Windows Firewall and Defender are disabled and that you do not have any other anti virus or internet security applications installed to avoid conflicts.
If your scan comes up with no infections found and you have made sure that you do not have conflicting software, run the Windows "chkdsk" program 2-3 times to make sure your hard drive is not failing.
Norton Authorized Support Team
i bought this computer about 1&1/2 years ago, it has been great. it is a hp a1720n which is a vista computer. anyway, for a long time, it worked flawlessly, but now, i am starting to have some problems. it intemittently locks up while i am on the internet, which is primarily what i do. i have norton 360 to help ward off the nasties, and it is supposed to have some utilities as well. i have run them, with no luck finding my problems. so i guess i need something else to help me find what is causing the problem. sometimes it even happens when i am just checking my e-mail, so it is not like i am going to viscious sites. can somebody direct me to some way of finding out what is causing my problems? thanks.