Problem with lost acces to maps (UEFN)

Hello! Dear participants of Unreal Engine forum, please help me with this problem, what’s my problem? My problem is "After resetting my Windows (where the maps were stored), i lost every maps (who did not use Unreal Engine Control of Versions) and I do not know how their recover. If anything, the maps are published!" Do know how do this? Please help me! I will be very grateful to you!