If some keyboard key is pressed several times in the short period of time, the accessibility window will appear.
It’s possible to disable this behaviour.

Just create the following REG-file and import it with the regedit:


Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Control Panel\Accessibility\StickyKeys]
"Flags"="0"


Alternative: just do it from the command line:

REG ADD "HKEY_CURRENT_USER\Control Panel\Accessibility\StickyKeys" /v Flags /t REG_SZ /d 0 /f


Restart after the operation could be required.