Norton Internet Security 2008 is indicating the following:

Realsched.exe made 57 modifications to Windows Startup

AutoKit.exe made 336 modifications to Windows Startup

Autobar.exe made 8 modifications to Windows Startup

I have not done any updates or actions that would have triggered this.
Should I be worried? What do I need to check and do in order to be sure that
this is not the result of Malware, Spyware or a Virus?

Thanks!