Yes, my dogs were having an anxiety episode so i had to step out for a few.,,ok i have seen a few cases where the windows boot hard drive was corrupted by a linux install, and i used a linux live dvd session to access the boot-repair, but i had to get online to get it from repositories and load it into the OS session, i haven't used a hirens rescue before, but i will look it up, do you have a USB stick to put it on?
but first things first, is your BIOS keeping correct time and date? If so, then you will need to reset the BIOS to default settings, it should be in the main menu, the first one on the left.
this is the support link i found for your sony laptop..not readng the boot hard drive
and here is a nice explanation of Hirens..
and here is the Ubuntu dual boot official documentation..
Edited by synergy513, 29 March 2018 - 05:25 PM.