The w32time errors will not cause a system crash. In fact, other than not being able to update your PC's time by getting a time tic from a time server, it will have zero effect on the system.
Still, no sense in letting that particular error keep showing up so I'd suggest one of two things:
1. configure your PC to look for an internet time server that exists and if you are on dial-up, to do so at a time when you will probably be on line
2. stop and disable the w32time service
You can try the settings via Control Panel > Date & Time > Internet Time
or:
http://www.windowsbbs.com/showthread.php?t=41108
Also just to simplify things let's try to get rid of BullGuard & Norton.
Start > Search > bullguard
also: XCOMMSVR.EXE
delete all finds & then empty your recycling bin.
What version of Norton were you running?
We can search Symantec for removal software.