need help urgent

[Pranav Nag]

hello sir,

i had 64 bit windows 7 in my sony vaio laptop. i installed ubuntu 10.04 on my 
sysem. but i dont know why it occupied about 95 GB of space or may be made 
another partition.
itried to remove ubuntu 10.04 but was unsuccessfull. Then i installed win 7 
again from recovery partition but on restart it gave error     

error : unknown filesystem
grub rescue> |



what to do now sir please help me. my system is not booting after that!

need your help.
please reply as soon as possible
 Pranav Nag


      
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