Try the registry edit offered here:
Off the Balloons Tip:
One of the features that's new to XP is the pop-up balloons to let you know that a tour, or hotfix, or network connection (etc.) is available. If you find these simply annoying, you can add the following Registry entry to kill them off for good.
Data Type: REG_DWORD
If you later decide that you want the balloons back, you can delete the entry, or set its value to 1. As always, please use caution and frequent backups when editing the Registry.
I'm running Windows Xp Home and the little message balloon pops up alot that tells me about my connection speed for the net (I have dsl). How can I get rid of this annoying balloon and can I just get rid of just that one? I just want to make sure if there is another balloon that pops up for something important, I don't want to miss it. Thanks