Dear setu,
I seems to be problem with your RPC
just check this
start->setting->control panel->administrative tools->services
Right side of the window you will find the all the services
check the following services
1.Remote Procedure Call (RPC) Locator
2.Remote Procedure Call (RPC)
3.Remote Access Connection Manager
4.Remote Access Auto Connection Manager
If you double click each service,property window will open
Go to 'Recovery' Tab
you fill find
first failure
second failure
subsequent failure
In each column should be 'Take no action'
Probably in your computer it may be 'Reboot the system'
If you are not sure don`t do it.Get professional help.
There is no problem of gtran phone while connect to internet.
Rgds,
Sajin
Bangalore