>I assume you've ruled out external factors, such as someone microwaving a burrito right next to the wireless router < g >

Outch

>You can check your System and Application event logs around the time of the failure.

I have this one complaining just before it happened. See attached.

>If it's a fairly new computer there may be firmware updates available to address reliability issues. Depending on how WiFi is implemented in that computer, you may be able to apply a motherboard firmware/BIOS update and/or a firmware update for a separate WiFi adapter. You can check the manufacturer's support site for details.

I will check for that.

>Drivers:
>
>- make sure you have drivers for all hardware devices i.e. that there are no "unknown" devices showing in Device Manager
>
>- Check for updated wireless adapter drivers from your manufacturer's site. Use those OEM drivers instead of generic/reference Windows or hardware vendor drivers. This is because OEMs sometimes tweak reference designs

Ok