Recently I transfered my Windows 10 to SSD drive and have other 2 HDD in my pc and moved some system folders to drive D cause my SSD is only 120Gb. Two days ago I updated the driver to the beta version but after restart my computer did not boot. Checking the system I realised that every drive letter (volume) was changed. After assigning the correct letters rebuilding BCD and fixing boot and mbr the system started again. Yesterday I decided to test the main version of the drive and after restart the same thing happened again. Now I corrected the volume letters and everything is working again, but anyone could tell what happened? The drive letters should not be affected by the driver installation. Could be because the presence of the SSD?