Vista Network Connectivity Issue

I am using two Windows OS using dual boot. Previously 1st I had Windows XP and my latest addition is Windows Vista Ultimate.
However I am stuck up with a weird problem for network connectivity. I have
configured network settings of Vista exactly same as my XP, however I am
unable to ping my ISP's gateway from Vista.
Is is showing error message as "Destination host unreachable"

The same is working perfectly
from XP. I disabled Firewalls of Vista, but no result.
I do have Norton 2007 AV on both the OS and have allowed to run all default configurations on both them.

Can anyone help me in zeroing on the issue?

 

Please supply the following info.

The name of your ISP and country of residence.
Make/model of the broadband modem. If dial-up, please specify.
Make/model of the router (if any).
Connection type, wired, wireless.
Make/model of network card or wireless adapter.
Make/model of your computer (motherboard if home-built).
Version and patch level of Windows, i.e. XP-Home SP2.

On the Vista machine, do this:

Start, Run, CMD to open a command prompt:

Type the following command:

IPCONFIG /ALL

Right click in the command window and choose Select All, then hit Enter.
Paste the results in a message here.

If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.