Dear Venu,
if you type the address manually in IE does it work? I never heard from such issue and guess it could be a local problem on your computer. Do other user have the same issue? Or is it only on your computer?
Use the following format to type manually:
http://<servername>:8001/nwbc/~launch/?sap-client=<client>
Change <servername> and <client> to your configuration.
Regards,
Alessandro