If you recall Windows 98 at one point during the installation you got a message that said "If your computer seems to not be responding for a really long time, reboot the computer". Problem with this instruction is the coders (in this case Microsoft) are aware there is a problem during the installation, otherwise, what would be the point of printing this message? So if you know the problem exists, why not fix it, instead of printing a message like that?

Which brings me to the "Update installation failed" message printed by Firefox, when it fails to update itself. Why would you code the software to tell the user the update failed, instead of just fixing the problem? Doesn't make much sense to me.