Upgrade to XP? I've finally done this at work, and I have to say, it's a much nicer OS to use than Vista - the speed boost alone makes it worth taking the step.
I don't know whether that would help with WiFi mind. On a more pertinent note - while you don't want to blame the OS, the fact that a reboot fixes it would tend to at least point the finger in that direction. I would have suggested changing channels, which worked for me to fix my own WiFi issues when I was setting up, but since you've tried that, I'm really not sure.
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