I was talking with a client who wanted to make his desktop wireless.  I set him up with a wireless PCI card adapter for his computer, told him how to install it, I offered to do it, but he said he was ok.  So I get a call from his last night, seems that everything went ok, except this....He has a D-link wireless router, and the PCI card is a Linksys.  Seems that the connection is seen by the computer, but won't allow him to access his network. I told him to turn off the router for 30 seconds and SEE if that helps, it didn't.  

Is there something I am missing?  I've heard how Linksys is PICKY, could this been an issue where he needs to stick with D-link?

Thanks for the help.
Does the router have MAC filtering enabled?  (It should do.)  If so, you'll need to add the PCI card's MAC address to the exception able.

Is WEP/WAP encryption in USE?  Have the keys been set up correctly?  Encryption is ESSENTIAL on wireless networks.Encryption is essential.  I believe they told me that they were using a WEP key.  I didn't get a CHANCE to look at it, we were speaking over the phone.  Next time I talk to him I will find out for sure.