There are many disk partitioning softwaresmany disk partitioning softwares that can help you.
The
The easiest way to get your partition back is to run live linux CD/DVD if you have it and start GParted or some other partition software that is on live CD and format partition back to NTFS.
Also
Also there is Ext2Fsd - a Windows file system driver for the Ext2, Ext3, and Ext4 file systems. It allows Windows to read Linux file systems natively, providing access to the file system via a drive letter that any program can access.
There
There are applications that can read linux partitions like DiskInternals Linux Reader or Ext2explore.