I received my new wireless card today (Dell Wireless 1395 - the one that Dell now recommends for my system).  I installed it and as soon as I powered my laptop on, the card was recognized, driver software had already been installed (somehow), and the card detected available wireless networks.  I am now connected wirelessly using this card. Sundeep B, thank you very much for all of your help!
For the past few weeks, I have been having trouble maintaining a steady wireless internet connection.  I intermittently lose the connection or the strength of the connection fluctuates.  I have an Inspiron 1521, with a Dell Wireless 1390 Wlan Mini-Card.  Also, I am running Windows 7. A couple of hours ago, I suddenly lost my wireless connection and could not reestablish it.  I ran the diagnostic tool, which reported that there was a hardware or driver-related problem with my 1390 mini-card.  Now, when I go into Device Manager, it has an exclamation point next to it and it says "This device cannot start (Code 10)". I have restarted my system and downloaded and installed this driver ([URL] .  Device Manager now says, "Windows has determined the driver software for your device is up to date," but there is still a Code 10 error. Does this just mean that the card needs to be replaced?  I am not sure what to do now - any help would be appreciated.
Problem with 1390 Mini-Card on Inspiron 1521