Thanks for ur answer ,i have tried deleting windows folder from d-drive but i couldn't delete, whenever i tried to delete it system would pop up a window saying you cant delete this file with .dll extensions. so i searched on net for a software (File Shredder) to delete this files and i downloaded it and installed on win 7 and deleted windows folder and it worked.
I dont wanted to format that drive because that drive was full upto 150gb and i couldnt move my this data.so i wanted to delete windows folder only from that drive.
any ways thanks for ur valuable suggestions ..........