Windows 7: i have merged my extended partitions to one,now not able to view

hello,

can any one help me with this issue...
i have 4 partitions as c,d,e,f... i have merged d,e,f using disk management tool from windows 7. everything went fine till i merged three extended partitions to one. now i can't delete the free space now. when i right click i can see New shrink volume and delete partition options but i can't delete my freespace. when i do so i got a message like can't delete partition an error occurs statins that not enough space available on disk to complete this operation"
and i am not able to see my partition in my computer.
now i shutdown my system and started now it showing no partition found Grub error.

i have linux in this but i didnt touch that partition...
my model is sony viao VPCEB15FM...please let me know how to resolve it...i tried with internal backup but no use.

i would be thankful if you can find a solution for me...

I would recommend using a partition program outside Windows: Partition Wizard is what is usually recommended on here. Use the bootable CD version.