Good question but even changing a system you install to one machine such as a P4 to a P4 HT can result in changes like that.
Did you want to dive into a computer science discussion about race conditions, packet delay, and how the whole thing works because we would have to sketch out the entire Windows OS, DOS, toss in some history and then some Computer Science about computer architecture and more.
Let's chalk this up to it will happen.
PS. I see a note about ZClient. Be sure to google that error message.
Gateway, WinMe, IE Version 6,
I only have 2 system tray icons at startup...Avast Anti-Virus and Zone Alarm Free (version 6.1.744.1).
I've had this computer for 7.5 yrs now. I guess I should read up on startup, but...Why do the 2 icons sometimes swap places?
The only time this happens is when I go to chat room(s), and the other issue is when I reboot or restart the next day, I'll get the error dialog box that says:
"ZClient has caused an error and will now close"
I imagine it must be because chat rooms aren't the safest?
Don't know if this matters but this is what I have loading at startup under MSCONFIG:
scan registry, zonelabs client, avast websv.exe, avast ashserv.exe, state mgr, true vector, and tweak UI--which if always loads even if I uncheck box.