But let's go with it. Disk to disk recovery systems break all the time. I have never done any forensics but start over with a Windows install DVD or now USB to wipe the drive and do a clean install.
If you feel there should be a diagnosis or forensic on this I have to leave you at HP's mercy or worse. I can only share how we recover from such incidents.
HP support said the install function from the repair/install files on separate partition on HDD would allow me to make additional partitions. Well, it did not. So, right after install completed, I went to disk management to do so. However, the installed win 10 is occupying 3% of 880g hdd, but disk mgt says that only 470M is unallocated and can be moved to another partition.
I did a defrag and it only slightly changed that number.
Why the discrepancy?
HP All-in-One - 24-e025t