- Windows < 8:
sfc /scannow
- Windows >= 8:
DISM /Online /Cleanup-Image /RestoreHealth
(requires an Internet connection)
chkdsk C: /F /R
See the accepted answer on "How to really turn off already disabled AutoCorrect feature in Windows 10" using group policies.
Recover erroneously hidden icons in the system tray (e.g. the sound symbol)
See http://www.drwindows.de/windows-anleitungen-und-faq/14758-verlorene-icons-im-infobereich-wiederherstellen.html (in German)
Basically:
-
Remove the following keys from
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify
:IconsStreams
PastIconsStream
-
Restart explorer.exe through the Task Manager (or simply restart your PC).