NTFS does not immediately delete the contents of files, neither does it delete the file name. The MFT entries may still be there, just marked as deleted. Therefore it can be possible to restore files by marking removing the "deleted" flag.
However, please note that the more changes are made to the disk, the unlikely the recovery will be. Also, there is no guarantee that the file contents have not been modified in the meanwhile. There may have been a different file temporarily, overwriting part of your data. Therefore it is highly recommended to perform an integrity check of the recovered data. In many cases, this is not possible (e.g. text files which have no sort of checksum).
In practice, I have successfully used AccessData Forensic ToolKit Lite which is available for free. Be careful with it, you may destroy your whole disk. You should know what you're doing - and if you didn't know above details about NTFS, maybe you should not use it.