For the past few weeks my system keeps rebooting. I have tried everything including purchasing Systems Tools by Symantec. It seems to happen unpredictably but once it starts its continues. Also always reboots when running a full system scan with Norton's internet security 2005

please help I have researched and cannot spend my every free minute trying to fix this!

First off change this setting:

rt. click My Computer then click Properties then Advanced then Startup and Recovery Settings then unclick Automatically restart

At the next crash copy your blue screen data here.

Also: look in your Event viewer: rt. click My Computer then click Manage then Event Viewer.
Or: Administrative Tools/Event Viewer or Start/Run/ eventvwr
Open the system as well as the application tabs & look for X errors. Click error line for details.
Post back the source & event id especially of errors that seem to coincide with a crash.

Also go to Start | Search & type in .dmp
Any finds?