Q: Why does my machine show a Test Mode stamp in the bottom right corner of my desktop?
A. If your system shows a "Test Mode" stamp in the bottom right corner of your display you have likely turned on test signing of drivers.
This can be confirmed with the bcdedit /enum command (note the testsigning value):
C:\Windows\system32>bcdedit /enum
Windows Boot Manager -------------------- identifier {bootmgr} device partition=\Device\HarddiskVolume7 description Windows Boot Manager locale en-US inherit {globalsettings} bootshutdowndisabled Yes default {current} resumeobject {5f599037-de4a-11e1-8931-b2ebfcc6f15f} displayorder {current} toolsdisplayorder {memdiag} timeout 30 Windows Boot Loader ------------------- identifier {current} device partition=C: path \Windows\system32\winload.exe description Windows Server 2012 locale en-US inherit {bootloadersettings} recoverysequence {5f59903b-de4a-11e1-8931-b2ebfcc6f15f} recoveryenabled Yes testsigning Yes allowedinmemorysettings 0x15000075 osdevice partition=C: systemroot \Windows resumeobject {5f599037-de4a-11e1-8931-b2ebfcc6f15f} nx OptOut
To fix the problem turn off the test signing and enable the integrity checks:
C:\Windows\system32>bcdedit.exe -set loadoptions ENABLE_INTEGRITY_CHECKS The operation completed successfully. C:\Windows\system32>bcdedit.exe -set TESTSIGNING OFF The operation completed successfully.
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