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So if you followed Method 1 of how to disable signature driver checking, you may see “Test Mode Windows 7 Build 7600 on the bottom left corner of the screen”. If you want to re-enable driver checking and remove the test mode message, just do the reverse of Method 1 by going into command prompt again (run as administrator) and type the following:
bcdedit.exe -set loadoptions ENABLE_INTEGRITY_CHECKS
bcdedit.exe -set TESTSIGNING OFF