in between work somehow i deleted the linux partition from windows. now i am booting up in the grub mode. and it doesnt even accept the cd drive also that too in a notebook. i went to bios and changed my order of booting to cd->rom and then hdd.. but it directly goes to the grub command line when i boot it up.. i am really new to this.. can anyone help me in thei problem. i really want to recover all the files of windows .. please.. thank you very much for helping me.

Are you saying that you can not boot from CD now? That sounds very odd. Where your machine boots from is soley controlled by the BIOS. If you have a bootable CD rom in the CD rom drive and you have set your pc/laptop to boot from CD this is exactly what it should do. If this is not happening make sure your CD is bootable by testing it in another machine. This side of things is outside of the control of the software.
If you do manage to get your machine to boot from cd then just reinstall linux over the exisiting Linux partition and everything should be OK. What you will be achieveing by doing this is reinstalling your grub loader. Which will then allow you to boot into either linux or windows

Use command from DOS or from Windows Recovery Console to write a MBR that boots the bootsector of the active partition.