they should be able to do a emergency boot disc
if they have all the information
but i would try and do a restore of the two missing partitions first.
and then see if the data is still there.
which it should be.
use a program called mini tools this has not let me down once yet.
it will show you the missing partitions and your be able to restore it with the working c drive.
and should show in windows.
hopefuly kaspersky endpoint Uncrypt the data unless its got more security addons.
https://www.minitool.com/free-tools/min ... overy.html