Grub rescue error

this grub rescue error is different one from other..it ll be a challenge for you...pls help me out of this..

hi plzz respond to this immediately..urgent..

my lap details about boot option are

1) i wont have cd-rom(keep it in mind) only USB boot option available but it s useless..i hve tried lot in that
2) using usb boot it wont entering cause it automatically loads as below after BIOS running
       GRUB LOADING...
       WELCOME TO GRUB!
       ERROR FILE NOT FOUND
       ENTERING INTO GRUB RESCUE MOOD
       GRUB RESCUE>
3)After this as described in other issues as below
        grub rescue> ls
        (hd0,4) (hd0,3) (hd0,2) (hd0,1)
 grub rescue> ls (hd0,2)/boot
 ... grub ... initrd.img-2.6.32-33-generic ... vmlinuz-2.6.32-33-generic
 here is my problem arises
 in my system it is coming as below
       grub rescue> ls
       (hd0) (hd0,msdos1) (hd0,msdos2) (hd0,msdos3) (hd0,msdos5) (hd0,msdos6)
after this i cant able to find the partition with the /boot directory containing vmlinuz... and other boot image files...
i tried but all failed to get..
als if entered as below for this alone command im getting reply as below
       grub rescue> ls (hd0,4)/boot
       "no such partitionfound"
so im stucked...here pls help me
this problem arises cause.. my lap s dual booted as ubuntu and win7..after that i deleted that partition of 100gb without knowing that it s for ubuntus MBR.. help me aft i restarted my lap gave error as above..