Hi Priyesh,
I think these is a good script..u can use it but u will have to tweak the mesh even after using the script............definately will reduce ur tweaking load....
Here is the way u can use the script.............Copy the script and paste it into "C:\Program Files\Autodesk\3ds Max 2010\Scripts\Startup" then restart 3ds max....as in Picture 1 u can see a popout that shows how to use script...click Ok on that and after that.....click on "Customize User Interface" under Customize in the menuBar...these will pop a window as shown in image 2..after that go into toolbars tab and find quadrangulate and drag that to the tool bar....it will create a button as shown in image 3........now select the mesh that u want to quadrangulate and click on that button as shown in image 4...
Sorry I might be bad at explaining.....
Hope that helps
Cheers