Here is the log; the PC seems fine now.

Fix result of Farbar Recovery Scan Tool (x64) Version: 14.03.2018
Ran by david (28-03-2018 11:48:07) Run:2
Running from C:\Users\david\Desktop
Loaded Profiles: david (Available Profiles: defaultuser0 & david & Administrator)
Boot Mode: Normal
==============================================

fixlist content:
*****************
CloseProcesses:
CreateRestorePoint:
C:\Users\david\AppData\roaming\IObit\AdvancedSystemCleaner
C:\Users\david\AppData\Roaming\IObit
C:\ProgramData\IObit
Emptytemp:

*****************

Processes closed successfully.
Restore point was successfully created.
"C:\Users\david\AppData\roaming\IObit\AdvancedSystemCleaner" => not found
C:\Users\david\AppData\Roaming\IObit => moved successfully
C:\ProgramData\IObit => moved successfully

=========== EmptyTemp: ==========

BITS transfer queue => 10510336 B
DOMStore, IE Recovery, AppCache, Feeds Cache, Thumbcache, IconCache => 6624606 B
Java, Flash, Steam htmlcache => 0 B
Windows/system/drivers => 335566 B
Edge => 0 B
Chrome => 811988784 B
Firefox => 0 B
Opera => 0 B

Temp, IE cache, history, cookies, recent:
Default => 0 B
Users => 0 B
ProgramData => 0 B
Public => 0 B
systemprofile => 0 B
systemprofile32 => 0 B
LocalService => 1642 B
NetworkService => 0 B
defaultuser0 => 0 B
david => 10503502 B
Administrator => 0 B

RecycleBin => 0 B
EmptyTemp: => 801.1 MB temporary data Removed.

================================


The system needed a reboot.

==== End of Fixlog 11:48:27 ====