[Q] Problem using galaxy y as modem for pc

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http://forum.xda-developers.com – I cant use my Samsung Galaxy Y as a modem for my pc. I have already installed USB drivers and setup modem settings on my Windows 7 pc. I am using an Airtel sim on my phone. 2G data is active. When i click connect, it shows "registering on network" and the arrows on the notification bar of my phone which shows the data transfer disappears and the data connection gets disconnected showing the data usage and then error appears on pc that connection failed and the data gets connected again on phone. I have tried many times but it fails everytime. I was using the same sim as modem with my (HowTos)