Another recurring issue with this limited connectivity is that not all cards seem to connect to routers with disabled SSID broadcasts or with some encryptions. What I do is start with no wifi security and see which items work or not.
Bob
system:Dell Dimension c521, windows xp
When tryng to connect with a MA111 wireless netgear adaptor, i received a lovely blue screen sayng bad_pool_header
found out i needed a driver to counteract said problem, which i have downloaded and used. However, although it connects to the netgear hub, it says i have little or no connectivity because "network did not sign a network address to the computer" when i pressed repair connection, it stated it could not renew the ip address.
can't use the windows wireless network connection wizard, because the driver i downloaded requires that to be disabled, so i have run out of computers.
my Dell is brand new!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic