I have a lenovo z510 model that came with windows 8. I was trying to multi boot with windows 7 but windows 7 need a mbr format. By default my HD was in gpt type soo with hiren tool, I converted my HD to mbr type for installation. In this process I damaged windows 8 and I cannot reinstall it though i successfully installed windows 7 in legacy mode. In uefi mode, it says boot manager is missing. I completely formated my HD and have no recovery media to reinstall windows 8. The reason for asking recovery media is that I called lenovo about the issue and this guy said about submitting laptop to lenovo service and they will order a recovery media which has a cost to pay. I asked about alternate method and he said that if any of your friend has same model i.e z510, you can make a recovey from him and it MAY recover your windows 8. Can any one guide my through the process of reinstalling and activating windows 8 or can any one give recovery of windows 8. I have taken win 8 embedded key by RW everything and I have a windows 8 single language iso downloaded through Microsoft media creation tool. Thanx for the reply.