All right: Now I am almost completely confident that it is an Explorer.exe issue, -not- just a Yahoo problem.
The reason: When explorer.exe hangs because of the Yahoo error popping up, even Antifreeze won't pop up. I tried it and it forced me to do a hard restart by disabling my ctrl, alt, delete functionality. I might as well get rid of Antifreeze as it won't be able to help me with this, but at least it served to show me the issue was beyond Yahoo as I have always suspected it was.
How might I go ahead trying to do a fix of explorer.exe? Should I attempt to remove my current explorer.exe with the one on the Vista disk? Or is there any other method I can do for this?
I mean, I am correct, yes: There is no reason that explorer.exe should hang 1 out of 4 times an error message pops up for a program, right?