I was driven mad by a problem on a little Netbook (Acer aspire One AOA150) I use for dangerous travel (i.e. its a disposable fully encrypted machine*) .
Running XP, I could not get it to connect to my home wireless, but it did connect to some wireless networks.
Turns out the problem is was that it could connect to WEP or unsecured networks, but not WPA or WPA2.
The wireless driver file that you get from Acer for this model (18.104.22.168) is faulty. You have to download a driver for another Netbook model like an AOD250 which offers you a newer driver (7.7.321) that works perfectly.Thanks to Tazzy and the Acer Guy for the solution.
I also encountered a problem when the laptop cuts out after 30 seconds to a minute. Just powers off. Dead.
The fix appears to be to uplug the cord and battery. Hold the power switch for 20 seconds. Plug in power cord. Boot. Plug in battery.
Seems to have worked.
*I user TrueCypt’s superb Full disk encryption for this.