Thanks all of you for your suggestions. I really appreciate that you have give valuable inputs. I can reload windows in my laptop thats not a big deal but I want to make everybody know about the problem which I faced. The point is, if the laptop is serviced and returned back, it should be in the original factory settings. The cost of Laptop did include the price of Win Vista. So why the company will not provide the item for which I have paid money.
For the sake selling they will push the product but when it comes to service, they simply wash off their hands.