Ok the errors start at 5:00:08 with this
escription: Failed to process schedule '4754ff9c-911b-4d67-9eb0-4d530fb456ab'. Exception: '?', hexadecimal value 0x04, is an invalid character. Line 756, position 93.
Check the scheduled task at control panel\tasks to see what that GUID is referring to. It sounds like the schedule is set to to something that Altiris cannot determined.
Then after that, at 5:04:58 the services are attempting to stop, and seem to do so. Then at 5:05:41 it looks like something is forcing the Altiris service (forcible termination) to stop, and then the WW3 svc (IIS\web) stops.
I'm curious as to what would be forcing these services to shut down. I've seen Altiris do this when the event queues get overloaded, but the log doesn't indicate a bunch of data coming in.
What hardware is your server on (memory, CPU, OS, and is the SQL server on box)?