Recover Partitions from diskpart -> clean command

Hi Guys, I was trying to install windows 7 on my windows 8.1 laptop (UEFI, samsung ATIV book 6) and when it didnt allow me to install Windows 7 on partitioned drive I followed some YouTube video foolishly from my phone and fired diskpart - clean command. everything gone after rebooted the system. Luckily I didnt do anything after that and referred one of the thread on sevenforums. followed...