Satellite Pro L40 (PSL43E) Wi-Fi intermittant

Well I am fed up with this laptop and its intermittent Wi-Fi connection.
You just dont know from powering up if it wants to work or not, and when it doesnt, it can be an absolute nightmare getting it to detect the router. The adaptor properties always say the device is working properly, and the wireless is always turned on. Other laptops never do this, just this Toshiba. It has naffed me off so much that this is deffo the last Toshiba I will be buying.
Ive never had such a frustrating laptop before even my old time computer was better than this one.

There are many models of L40, which presumably have some differences. A neighbour of mine also has a L40/PSL43 and is having WiFi problems which I am trying to help with, though my decade or more of WIndows and Linux expertise is in CPQ PCs and PDAs, and WiFi in general, rather than Tosh-specifics. Let's leave aside whether it was ever a bright idea to ship a Vista laptop with only 512MB, I'm fixing that later today with another 1GB, once I work out where the memory slots are (it's not in the user manual?!).
The laptop in this picture refuses to see any WiFi these days, although it has worked in the past. Now, without knowingly changing anything, it fails even in a setup where other systems see the WLAN just fine (ie the problem is likely with the laptop not with the WLAN). Fn/F8 under Vista always brings up the little WiFi popup but the WiFi is always crossed out, which doesn't seem right. The popup disappears without any opportunity to change anything and I haven't yet found any relevant docs or help; the only docs I have are the PDF user guide which doesn't shed much light on how Fn/F8 (or anything else) is supposed to be used to enable/disable the WiFi (or which of the covers is for memory slots).
Vista has all the individual updates applied (including a WiFi driver update) but not (yet) SP1.
The Tosh-supplied connectivity tool just tells me WiFi isn't working. MS control panel shows the WiFi device as present and working. The MS "repair connection" tool just tells me wireless isn't enabled and to sort that first.
So how do I make this wireless work? Suggestions (and references to relevant detailed help/documentation) most welcome. My current plan is to see if I can find a live Linux that understands this particular WiFi setup, and if I find one, see if WiFi works any better under Linux than Vista, just to prove that the laptop hardware really works OK.

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