How To Resolve "socket error 10050" when connecting with modem router

I just set up a wireless network for my sister and her kids.  The primary connection is from a Safecom 5 port wireless modem router (SWAMR-54125)  to the main home pc via lan.  In addition each of the 2 kids computer has a trendnet wireless usb adapter installed to connect them to the internet.  Configuration of the router was via a safecom wizard whick only asked for isp, user name and password.  After running the wizard the everything was fine, including the wireless connections.  However, today, my sister was on the net when suddenly the connection stopped working.  Similarly the wireless connctions stopped working too.  She tried restarting 1st the browser, then the pc and finally the router, all to no avail.  Finally, she tried running the wizard again, however instead of saying "connecting to the modem" for just a couple of seconds as it did on install, it satsaying it for a long time before coming up with "socket error 10050 - network is down".

I don't have a great deal of experience in networking, but I have never heard of this.  Can anyone help?  I don't know whether this would be a hardware or software error.  Do I have to send the router back, or do something to winXP on the main pc?  (All the pc's run XP)