Last night I could not get my desktop computer to talk to our new printer over the wireless network, even though my old laptop was talking to it just fine. After some poking around in the settings and finding nothing obviously wrong, Dave suggested that I use the setup disc to uninstall the printer driver and then reinstall the very same driver. (Note: The. Very. Same. Driver.)
I was skeptical but complied, and immediately thereafter was able to print from my desktop computer.
I have to wonder how people who deal with this sort of thing all the time can turn around and say that astrology is far-fetched.