Everytime i turn the computer on i get a message saying " The security program has been changed or modified. The program will be terminated." or something like that what does that mean?
Can't see anything particularly suspect in your hijackthis log. Can you give me a little more information, exactly when do you get this message:-
1> As windows loads?
2> At the logon screen?
3> or once windows has actually started?
4> does the message popup before or after the windows taskbar appears?
On the face of things it sounds like a windows system file maybe corrupt and is therefore crashing posibly somthing to do with the winlogon process as this is one of the first processes to start, and handles logon and shutdown procedures, although it appears to be running in your log.
Could be a little more specific and let me know exactly what the message says. It may help me pin point the problem.
It comes up once windoes has loaded
this is beyond my area of knowledge
If the programm is terminated already on Windows start, it won't be listed in HiJackThis-report anyway. I'm sure you already virusscanned your system, didn't you?
Perhaps it'll be usefull taking a look at the services started at boottime (go to start-menu -> execute, type "services.msc") and also at the autostart-folder.
I would start with reinstalling Norton Internet Security (if you must use it)
If it were my box, the Symantec software would be ripped out and something else installed.