Hi All Expert, Good day. I have one user which is having unknown driver issue, with mouse and keyboard not being to control. The only way is through F8 disable driver signature enforcement. I have try bcdedit /set testsigning on, bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS bcdedit.exe -set TESTSIGNING ON, also tried on gpedit ->User Configuration -> Administrative Templates -> System -> Driver Installation -> Code signing for drivers Click on "Disabled", then on "OK". I did a system restore before last week it works but somehow it came back again, also have disable windows update. All recent software have being uninstall and how can I check for unsign driver. Appreciate if anyone have this experience can advise me on. Thanks!