[Rebelbase]

I get an execution pop up at boot time that reads: "New messenger update available, do you want to update yes/no?"

Anyone know how I can disable that?

[RebelTex]

"New messenger update available, do you want to update yes/no?"  Anyone know how I can disable that?

That would depend on which Messenger service to which the popup refers.   Possible solutions:

1. Go ahead and let it update.  Then disable or turn off the Messenger service.
2. Open the specific Messenger service and find options or settings or preferences, then disable automatic updates.
3. Uninstall the Messenger service (can't if it's Windows Messenger - but you can disable it - see the link below).

How to prevent Windows Messenger from running on a Windows XP-based computer

Good Luck.
RT