I accidentally deleted 16 MB Microsoft reserved partition. PC didn't Boot after then. It was stuck without booting saying "unable to mount boot volume". I somehow managed to fix it by rebuildbcd. And now, it's booting fine. Now that 16mb partition is "unallocated". Do I need to do Anything? What was that 16mb partition? It wasn't the EFI partition. My efi partition is 256mb.
Thanks!