Thereafter, 2 netbooks (XP SP3) are unable to connect to the Internet as the network no longer shows up in the list of wireless networks. A refresh does not help.
I can connect a netbook to the Modem/Router via an Ethernet cable and all is OK.
On a notebook, if I right click the Wireless Network Connection and go to the Wireless Networks tab, my network name does show up in the Preferred Networks list (2nd entry - the first entry is the main Study PC (Vista - latest SP) which is not wireless).
Any ideas on what to do next?