Microsoft Wireless Client DNS Problem In Wireless Router?

DNS problem in Wireless router? - microsoft wireless client

Hello everyone,
I have a wireless router (D-Link DIR-635) and some wireless network cards (D-Link DWA-520).
I set up and connect to the DSL modem installation and Internet information about them.
Router is connected, but some pages are not accessible!
For example, Yahoo! Website (homepage) is available and will appear when I write in yahoo.com homepage of each client. and other sites such as microsoft.com, and ...
However, some websites! eg. Web sites like msn.com is not displayed.
We solve also cann't ping msn.com (for each client and the web interface) of the router! In addition, the DNS server is not configured correctly (manually set, they put the car FAI).
Please help me, is something special adjustments necessary?
Note: Some sites like http://answers.yahoo.com is after a couple of times available, but some sites like msn.com is not available.