dont install anything related to norton. Uninstall it if you can. Get rid of everything related to norton, use regcleaner,
http://www.vtoy.fi/jv16/shtml/regcleaner.shtml

Get rid of any symantec, norton, or liveupdate crap.
Next, dont install anything other than the OS and windows Updates. Run your PC for a day or two, see if it locks up. If not, then start updating your drivers for all your hardware, install a few programs, and see if it locks up. If not then try norton, but before you do, create a restore point,
start, all programs, accessories, system tools, system restore, click create restore point. Then install norton, do one at a time, the system works first then the system security. In between run your PC a few days see if it locks up. If it does uninstall and find an alternative software.
BB