You are trying to delete the 'Windows' folder probably created by another OS installation. Windows will not allow you to delete it even if the folder is not of the current OS. You can try a linux bootable disk.
But I don't want to format the whole drive or that partition as that part of the partition has nearly 200 GB of data which can't be transferred any where else, just want to delete the 10GB folder automatically created.
Are you friggin kiddin me. I told you to use Linux to delete that folder not Windows.