Event log is FULL of these errors right after he lost the ability to click the start menu and opening JPG files was very slow. Another Q here started after the system was dropped and I'll include the link. Need to figure out how to fix / delete / recreate corrupted logfile as indicated in this sample.
svchost (3148) TILEREPOSITORYS-1-5-21-173
1001: Corruption was detected during soft recovery in logfile C:\Users\USERNAME\AppData\
DB.log. The failing checksum record is located at position END. Data not matching the log-file fill pattern first appeared in sector 75 (0x0000004B). This logfile has been damaged and is unusable
The other is here: http://www.experts-exchange.com/questions/28806819/W10-HP-desktop-lost-OS.html
Thank you very much for help.