Cannot boot windows 10

A collegue has had a problem with her Windows 10 box and I'm trying to help her.

When the machine starts, we see the ble windows flag and then the machine produces a mouse-pointer with the circle for waiting... And this goes on for hours. At most we had it a day, just to see if something indeed was happening.

I've then created a recovery USB stick using MediaCreationTool1803.exe

When trying to repair from this, it doesn't find anything to repair, but only to clean install. But when I check from the cmd, I see there are some info left, but maybe a pointer have been lost?

When I start CMD from the recovery USB stick, I'm on x:

C: points to an empty 'System' partition

D: points to the ESD_USB stick.

E: points to a partition where the old Win 10 installation seems to be located.

(F and G points to HP recovery points, but the machine originally had Windows 7 on it and I'd prefer not to perform a factory reset back to that, unless absolutely neccessary).

Does anyone have any ideas how I can repair this machine, so I can use the info on the E: partition?

/Z