Hi all,
This is interesting. After installing SP2 to the server over the weekend, there has been connectivity problems. It seems to only affect laptops. The mapped network drives do not work and the Internet cannot be accessed. However, with wireles on, the laptops can get online. I have restarted DNS and DHCP. What else can I try? Thanks.

Clear the logs of Application and System and restart the server.
Then have a look at the logs.

Are there any errors in it?

Application -
The DSRestore Filter failed to connect to local SAM server. Error returned is <id:997>

The Group Policy client-side extension Microsoft Disk Quota failed to execute.

WINS Performance Monitor Counters could not get the WINS statistics.

System -
DCOM got error "The service cannot be started, etc.." attempting to start the service IISADMIN. (we do not use IIS)

The SQLSERVERAGENT service was unable to log on as MYDOMAIN\Admin with the current configured password due to the following error: Logon failure: unknown user name or bad password.

Each of those errors has an event id.
So now, you have to solve all these errors by searching the microsoft technet for possible reasons and solutions.

http://technet.microsoft.com

So now it's your turn.

OK, will read on and reply back if there is any progress. Thanks.

From what I am reading these aren't causing the issue. I believe it must be some setting was changed in either GPO or ADUC and heres why,

I made sure pcA and pcB are both listed in Mobile Users. My login is under mobile users (under Users). I am able to get a wired connection with pcA but not pcB.